The conditional probability of drawing a heart on the fourth draw, given that the first three cards are not hearts is 4.74%.
The conditional probability of drawing a heart on the fourth draw, given that the first three cards are not hearts, can be calculated using Bayes’ theorem:
P(heart on fourth draw | first three draws are not hearts) = P(heart on fourth draw and first three draws are not hearts) / P(first three draws are not hearts)
To calculate the numerator, we need to find the probability of drawing a heart on the fourth draw and the first three draws being not hearts. Since we are drawing without replacement, the probability of drawing a heart on the fourth draw is 13/49 (there are 13 hearts remaining out of 49 cards remaining). The probability of the first three draws being not hearts can be calculated as:
(39/52) x (38/51) x (37/50) = 0.4372
Therefore, the numerator is:
P(heart on fourth draw and first three draws are not hearts) = (13/49) x (39/52) x (38/51) x (37/50)
P(heart on fourth draw and first three draws are not hearts) = 0.0207
To calculate the denominator, we need to find the probability of the first three draws being not hearts. We already calculated this as 0.4372.
Therefore, the conditional probability of drawing a heart on the fourth draw, given that the first three cards are not hearts, is:
P(heart on fourth draw | first three draws are not hearts) = P(heart on fourth draw and first three draws are not hearts) / P(first three draws are not hearts)
P(heart on fourth draw | first three draws are not hearts) = 0.0207 / 0.4372
P(heart on fourth draw | first three draws are not hearts) ≈ 0.0474
So the probability of drawing a heart on the fourth draw, given that the first three cards are not hearts, is approximately 0.0474 or 4.74%.
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For a particular statistics exam, being male is independent of passing the test. The probability of being male is 0. 5 and the probability of passing the test is 0. 8. What is the probability of being male and passing the test?
The probability of being male and passing the test is 0.4.
The probability of being male and passing the test can be calculated using the formula for independent events: P(A and B) = P(A) × P(B).
In this case, A represents being male (P(A) = 0.5), and B represents passing the test (P(B) = 0.8).
Step 1: Identify the probabilities of the independent events.
P(A) = 0.5 (being male)
P(B) = 0.8 (passing the test)
Step 2: Apply the formula for independent events.
P(A and B) = P(A) × P(B)
P(being male and passing the test) = P(being male) × P(passing the test)
Step 3: Calculate the probability.
P(being male and passing the test) = 0.5 × 0.8 = 0.4
So, the probability of being male and passing the test is 0.4.
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The average annual precipitations (in inches) of a random sample of 30 years in San Francisco,
California have a sample standard deviation of 8. 18 inches. The sample is taken from a normally
distributed population. Construct 95% confidence intervals for the population variance and the
population standard deviation. Interpret the results
As per the confidence interval, the population variance is between 67.9 and 186.6 and the population standard deviation is between 8.24 and 13.67 inches.
To construct a 95% confidence interval for the population variance, we use the chi-squared distribution. The formula for the confidence interval is:
[ (n-1) x s² / chi-squared(α/2, n-1), (n-1)*s² / chi-squared(1 - α/2, n-1) ]
where n is the sample size, s is the sample standard deviation, alpha is the level of significance (in this case, alpha = 0.05), and chi-squared(alpha/2, n-1) and chi-squared(1-alpha/2, n-1) are the values from the chi-squared distribution that correspond to the upper and lower limits of the confidence interval.
Plugging in the numbers, we get:
[ (298.18²) / chi-squared(0.025, 29), (298.18²) / chi-squared(0.975, 29) ]
Using a chi-squared distribution, we find that chi-squared(0.025, 29) = 16.05 and chi-squared(0.975, 29) = 44.07. Therefore, the confidence interval for the population variance is:
[ 2994.6 / 44.07, 2994.6 / 16.05 ] = [ 67.9, 186.6 ]
To construct a 95% confidence interval for the population standard deviation, we take the square root of both ends of the interval for the population variance. Therefore, the confidence interval for the population standard deviation is:
[ √(67.9), √(186.6) ] = [ 8.24, 13.67 ]
Interpreting the results, we can say that we are 95% confident that the true population variance of annual precipitations in San Francisco falls between 67.9 and 186.6 square inches. Similarly, we are 95% confident that the true population standard deviation falls between 8.24 and 13.67 inches.
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if elisa gets an allowance of $30 per week and spends $10 of it on food and drink, $5 on entertainment and $5 on miscellaneous things, how much does she have available to put aside for savings each week?
Answer: She has 10$ to save
Step-by-step explanation:
Elsia has 30$ to start her week. She spent 10 on food and drink, (30-10=20) 5 on entertainment, (20-5=15), and 5 on Misc. things. (15-5=10). This means that the answer is 10.
Steps:
30-10=20
20-5=15
15-5=10
I hope it helped! :D
Which function has an inverse that is also a function? • g(x)=2x-3 •k(x) = -9x² • f(x) = |x + 2| •w(x) = -20
The function has an inverse that is also a function is g(x)=2x-3
What is Inverse function?A function that can turn into another function is known as an inverse function or anti function. In other terms, the inverse of a function "f" will take y to x if any function "f" takes x to y. The inverse function is designated by f⁻¹ or F⁻¹ if the function is written by f or F. Here, (-1) should not be confused with an exponent or an inverse.
A function takes in values, applies specific procedures to them, and produces an output. The inverse function works, agrees with the outcome, and returns to the initial function.
The solution in which x and y have been reversed is known as an inverse function.
The vertical line test determines whether a function succeeds or fails when you solve for y once more.
1. Here g(x) = 2x - 3 has inverse x = 2y - 3 which simplifies to;
[tex]y=\frac{x-3}{2}[/tex]
This is a line and is a function;
[tex]y=\frac{x}{2} +\frac{1}{2}[/tex]
2. k(x) = -9x² has the inverse x = -9y² which simplifies to;
[tex]y=\sqrt{x/(-9)}[/tex]
This is a function but only for certain values of x.
3. f(x) = |x+2| is an absolute value function.
Not all absolute value functions have function-based inverses.
4. A function's inverse does not exist for the equation w(x) = -20.
The function therefore has a negative that is also a function, which is
g(x)= 2x – 3.
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the probability of class failure is 7%. if 56 students take a class, what number of students is expected to fail the class?
The probability of class failure is 7%. If 56 students take a class, the expected number of students who will fail the class is 4.
We will use the above formula to find the expected value of class failure. Let x be the number of students expected to fail the class.
Expected value = Probability x Total number of trials
The probability of class failure is 7%, so the probability of passing the class is 100% - 7% = 93%. The total number of trials is the total number of students taking the class, which is 56. Putting these values into the formula gives us:
Expected value = 7% x 56
Expected value = 0.07 x 56
Expected value = 3.92
We cannot have a fraction of a student, so we can round this number up to get the expected number of students who will fail the class.
Therefore, the expected number of students who will fail the class is 4.
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Find the tangent of the larger acute angle in a right triangle with side lengths 10, 24, and 26.
Tangent of the larger acute angle:
Answer:
Step-by-step explanation:
Answer:4/3
Answer:
The tangent of the larger acute angle in a right triangle with side lengths 10, 24, and 26 is 12/5.
Step-by-step explanation:
In a right triangle, the hypotenuse (the side opposite the right angle) is the longest side.
Therefore, in a right triangle with side lengths 10, 24, and 26, the hypotenuse measures 26 units and the legs measure 10 and 24 units.
In a right triangle:
The angle opposite the shortest leg is the smallest acute angle.The angle opposite the longest leg is the largest acute angle.Therefore, the largest acute angle is between the hypotenuse and the shortest leg, which means the side opposite the angle is the longest leg.
The tangent ratio is the ratio of the side opposite the angle to the side adjacent the angle.
Therefore the tangent of the largest acute angle is:
[tex]\implies \sf \dfrac{O}{A}=\dfrac{24}{10}=\dfrac{12}{5}[/tex]
researchers find that pet owners live longer, healthier lives. within this study, pet ownership is the select one: a. independent variable. b. dependent variable. c. spurious variable. d. operational variable.
The answer is option A, pet ownership is the independent variable.
In experimental research, an independent variable is the variable that is manipulated by the researcher to determine its effect on the dependent variable. In this case, the independent variable is pet ownership, which is being studied to determine its effect on the health and lifespan of pet owners.
The dependent variable, in turn, is the health and lifespan of pet owners, which is expected to be influenced by their pet ownership status.
It is important to note that the relationship between pet ownership and health/lifespan could be influenced by other factors, such as age, income, or lifestyle. These other factors are known as spurious variables and can confound the relationship between the independent and dependent variables.
Operational variables, on the other hand, refer to how the researcher measures or manipulates the independent and dependent variables.
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students collect 600 cans for the canned food drive this is 80% of thier goal how many more cans do they need to collect to reachthier goal
Answer:
We can start by using algebra to solve for the total goal of the canned food drive. Let's let "g" be the total goal in number of cans.
If 600 cans is 80% of their goal, then we can write:
0.8g = 600
To solve for "g", we can divide both sides by 0.8:
g = 600 / 0.8
g = 750
So the total goal of the canned food drive is 750 cans.
To find out how many more cans the students need to collect to reach their goal, we can subtract the number of cans they've already collected from the total goal:
750 - 600 = 150
Therefore, the students need to collect 150 more cans to reach their goal.
Consider a closed rectangular box with a square base with side x and height y. a. Find an equation for the surface area of the rectangular box. S(x,y) (2x2 + 4xy b. If the surface area of the rectangular box is 138 square feet, find feet. dy when 2 = 3 feet and y = 10 da dy da =
a. To find the equation for the surface area of the rectangular box with a square base of side x and height y, you need to consider all the faces of the box. The box has two square faces with side x, and four rectangular faces with dimensions x and y.
Explanation:
The equation for the surface area S(x,y) can be calculated as follows:
S(x,y) = 2 * (area of square face) + 4 * (area of rectangular face)
S(x,y) = 2 * (x^2) + 4 * (x * y)
b. Given that the surface area of the rectangular box is 138 square feet, we can set up an equation using S(x,y) from part (a) and the given values of x = 3 feet and y = 10 feet:
138 = 2 * (3^2) + 4 * (3 * 10)
Now, we need to find the derivative of the surface area equation with respect to x (dS/dx) and y (dS/dy):
dS/dx = 4x + 4y
dS/dy = 4x
We can now plug in the given values for x and y to find dS/dx and dS/dy:
dS/dx = 4(3) + 4(10) = 12 + 40 = 52
dS/dy = 4(3) = 12
So, when x = 3 feet and y = 10 feet, dS/dx = 52 and dS/dy = 12.
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What is mutiplied by 6m-7 so that the produvct is 6m2-7m'
From the given information provided, m is multiplied by 6m-7 so that the product is 6m²-7m.
To find what is multiplied by 6m-7 so that the product is 6m²-7m, we can use polynomial long division or factorization. Here's how to do it using factorization:
We need to find two numbers that multiply to give 6m²-7m and add up to -7. We can factor the expression 6m²-7m as:
6m² - 7m = m(6m - 7)
So, we see that 6m-7 is a factor of 6m²-7m. Therefore, to find what is multiplied by 6m-7 to get 6m²-7m, we just need to divide 6m²-7m by 6m-7:
(6m² - 7m) / (6m - 7) = m
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In terms of the water lily population change, the value 3.915 represents: the value 1.106 represents:
The value 3.915 represents the y-intercept or the initial or baseline water lily population when there are no changes in the independent variable (x). the coefficient 1.106 represents the slope of the regression line or the rate of change in the dependent variable (y).
In the regression equation y = 3.915(1.106)x, the coefficient 3.915 represents the y-intercept or the value of y when x is 0. In the context of the water lily population change, this means that when there are no changes in the independent variable (x), the predicted value of the dependent variable (y) is 3.915, which represents the initial or baseline water lily population.
The coefficient 1.106 represents rate of change in the dependent variable (y) per unit change in the independent variable (x) or the the slope of regression line . In the context of the water lily population change, this means that for every unit increase in the independent variable (which could be time, environmental factors, or any other relevant variable), the predicted value of the dependent variable (y) increases by a factor of 1.106. In other words, the water lily population is expected to grow by 1.106 times for every unit increase in the relevant variable.
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____The given question is incomplete, the complete question is given below:
The regression equation you found for the water lilies is y = 3.915(1.106)x.
In terms of the water lily population change, the value 3.915 represents:
The value 1.106 represents:
Answer:
The value of 3.915 is the initial number
of water lilies. It is approximately 4, which matches
the data.
The value 1.106 is the growth rate. The rate represents growth for each day. The percentage growth each day is 10.6%
Step-by-step explanation:
In a basketball free-throw shooting contest shots made by Sam and Wil were in the ratio 7:9.Wil made 6 more shots than Sam. Find the number of shots made by each of them.
Answer:
Sam made 21 shots, and Wil made 27 shots.
if a college instructor alters the distribution of his or her students' midterm exam grades because the class did not do as well as last year's class, with what type of standards is the instructor most concerned?
The college instructor is most concerned with equity standards.
Equity standards are when an instructor adjusts grades to ensure fairness to all students regardless of their individual performances.
This means that if a class as a whole does not do as well as last year, the instructor will alter the distribution of grades so that the overall grades reflect the effort put in by the class.
For example, if the class average is a C, the instructor may raise some grades to a B or even A in order to ensure that the grades are fair to all students in the class.
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Drag each tile to the correct box.
Arrange the cylinders in order from least volume to greatest volume.
a cylinder with a diameter of 28 units
and a height of 18 units
a cylinder with a radius of 13 units
and a height of 17 units
a cylinder with a diameter of 30 units
and a height of 14 units
a cylinder with a radius of 12 units
and a height of 20 units
Therefore, the cylinders arranged in order from least volume to greatest volume are:
Cylinder with diameter 28 units and height 18 units
Cylinder with radius 13 units and height 17 units
Cylinder with radius 12 units and height 20 units
Cylinder with diameter 30 units and height 14 units
What is volume?Volume is the measure of the amount of space occupied by a three-dimensional object. It is typically measured in cubic units, such as cubic meters or cubic feet. The formula for finding the volume of a solid depends on the shape of the object. For example, the volume of a cube can be found by multiplying the length, width, and height of the cube, while the volume of a sphere can be found using the formula (4/3)πr³, where r is the radius of the sphere.
Here,
To compare the volumes of the given cylinders, we need to use the formula for the volume of a cylinder, which is V = πr²h, where r is the radius of the circular base and h is the height of the cylinder. Let's calculate the volumes of the given cylinders:
Cylinder with diameter 28 units and height 18 units:
radius = 14 units
volume = π(14²)(18)
= 8,365.98 cubic units
Cylinder with radius 13 units and height 17 units:
volume = π(13²)(17)
= 8,724.68 cubic units
Cylinder with diameter 30 units and height 14 units:
radius = 15 units
volume = π(15²)(14)
= 9,420.98 cubic units
Cylinder with radius 12 units and height 20 units:
volume = π(12²)(20)
= 9,014.47 cubic units
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a worksheet has a perimeter of 48 inches and an area of 135 square inches. what are the dimensions of the worksheet?
The dimensions of the worksheet are 15 inches by 9 inches.
According to the question a worksheet has a perimeter of 48 inches and an area of 135 square inches. The dimensions of the worksheet are to be found.To find the dimensions of the worksheet we have to follow the steps given below:
Step 1: Let’s assume the dimensions of the worksheet are L and B.
Step 2: Calculate the perimeter of the worksheet which is the sum of all the sides of the worksheet.Perimeter of a worksheet= 2(L + B) = 48 inches⇒ L + B = 24
Step 3: Calculate the area of the worksheet which is the product of the length and breadth of the worksheet.Area of the worksheet = L × B = 135 square inches.
Step 4: Find the values of L and B by solving the equations L + B = 24 and L × B = 135 by substitution.The value of B can be found by substituting L = 24 - B. in the second equation.L × B = 135(24 - B) × B = 13524B - B² = 135B² - 24B + 135 = 0B = (24 ± √(24² - 4 × 135)) / 2 = 9 or 15(As the dimensions can’t be negative, we choose B = 9)When B = 9L = 24 - 9 = 15.
Thus, the dimensions of the worksheet are L = 15 inches and B = 9 inches.In other words, the dimensions of the worksheet are 15 inches by 9 inches.
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Ejemplos prácticos de cuando usamos la fórmula general en nuestra vida cotidiana? Ayúdenme por favor
What number is in between 2/5 and 8/15 in its simpilist form
Answer:
búscalos
Step-by-step explanation:
Answer:
7/15
Step-by-step explanation:
2/5 can be converted into 6/15 by multiplying the numerator and denominator by 3. The next number between 6 and 8 is 7, so the answer is 7/15.
to avoid a near midair collision (nmac) with a manned airplane, you estimate that your small ua climbed to an altitude greater than 400 feet agl. to whom must you submit a written report of the deviation?
you estimate that your UA climbed to an altitude greater than 400 feet above ground level (AGL), you must submit a written report of the deviation to the Federal Aviation Administration (FAA).
If you are operating a small unmanned aircraft (UA) and have had a near mid-air collision (NMAC) with a manned airplane, and you estimate that your UA climbed to an altitude greater than 400 feet above ground level (AGL), you must submit a written report of the deviation to the Federal Aviation Administration (FAA).
According to the FAA regulations, any UAS operator involved in an NMAC with a manned aircraft must submit a report to the FAA within ten days of the incident. This report must include the date, time, and location of the incident, as well as a detailed description of the events leading up to the NMAC.
You can submit the report online via the FAA's Aviation Safety Reporting System (ASRS) website. The ASRS is a voluntary reporting system that allows pilots and UAS operators to report incidents without fear of enforcement action, provided that the incident was not a result of reckless or intentional behavior.
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A 30-foot support cable is attached 22 feet up from the base of an electric pole. What is the measure of the angle to the nearest tenth that the cable makes with the ground?
Answer:
In this problem, we have a right triangle where the hypotenuse is the 30-foot support cable and one leg is 22 feet (the distance from the base of the pole to where the cable is attached). To find the angle that the cable makes with the ground, we need to use trigonometry. The tangent of an angle in a right triangle is equal to the length of the opposite side divided by the length of the adjacent side. In this case, we want to find tan(θ), where θ is the angle between the cable and the ground. Therefore, tan(θ) = opposite/adjacent = 22/30 = 0.7333. Taking inverse tangent on both sides gives us θ = tan^-1(0.7333) ≈ 36.7 degrees to one decimal place. Therefore, to the nearest tenth, the measure of the angle that the cable makes with the ground is approximately 36.7 degrees.
in conducting a lagrange multiplier test for second-order autocorrelation at the five-percent level of significance, what is the critical value to be used? show your work.
The critical value to be used in conducting a Lagrange multiplier test for second-order autocorrelation at the five-percent level of significance is 3.84.
The Lagrange multiplier test is a technique for testing hypotheses concerning the existence of structure in the disturbance term of regression models. In a variety of econometric models, the presence of autocorrelation (serial correlation) and heteroscedasticity are two examples of such structures.
The LM test is used to determine whether or not autocorrelation is present in a regression model, with the null hypothesis being that there is no autocorrelation. The null hypothesis is always of the form that there is no structure in the disturbance term, i.e. that the errors are not autocorrelated, and the alternative hypothesis is always of the form that some or all of the coefficients are nonzero, indicating the presence of autocorrelation or heteroscedasticity.
The critical value for the Lagrange multiplier test is calculated using a chi-squared distribution, with the degree of freedom being equal to the number of coefficients tested.
The formula for the Lagrange multiplier statistic is given:
LM = T * R² where T is the sample size and R² is the coefficient of determination for the regression.
This value is compared to the critical value of the chi-squared distribution with one degree of freedom to determine whether or not to reject the null hypothesis of no autocorrelation.
The level of significance of the test determines which critical value to use. In this case, the level of significance is 5 percent, so the critical value is 3.84.
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Find all unknown values for the given right triangle I'll make sure you are the brainiest
The Answer of the given question based on the triangle is angle ∠α ≈ 56.4° degrees , angle ∠β ≈ 33.6° degrees , side C ≈ 14.4° units.
What is Hypotenuse?In a right triangle, the hypotenuse is the longest side and it is opposite the right angle. It is the side that is directly opposite the right angle and is always opposite the largest angle of the triangle. The hypotenuse is also the side that connects the two legs of the right triangle. The length of hypotenuse can be found using Pythagorean theorem.
From the problem statement, we know that angle ∠gamma = 90° degrees, which means that BC is the hypotenuse of the right triangle. We also know that side A = 12 and side B = 8.
Using Pythagorean Theorem, we can find length of hypotenuse by:
c² = a² + b²
c² = 12² + 8²
c² = 144 + 64
c² = 208
c = √(208)
c ≈ 14.4
So the length of BC is approximately 14.4 units.
To find the altitude CA, we can use the formula for the area of a right triangle:
area = (1/2) * base * height
Since angle gamma = 90° degrees, the altitude CA is equal to the length of side A:
CA = A = 12 units.
Now we can use the trigonometric ratios to find the acute angles∠α and :
sin(α) = opposite/hypotenuse = CA/c
sin(α) = 12/14.4
α ≈ 56.4° degrees
Since α and gamma are complementary angles (they add up to 90° degrees), we can find β using the following formula:
β = 90 - α
β ≈ 33.6° degrees
Therefore, the unknown values for the given right triangle are:
angle ∠α ≈ 56.4° degrees
angle ∠β ≈ 33.6° degrees
side C ≈ 14.4° units.
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find a equation of the line through the point(-6,-5) and (-1,1))
a. y=6/5x + 11/5
b. y=6/5x - 11/6
c. y=6/5x
or
d. y=6/5x + 11/6
Answer:
The slope of the line passing through the points (-6,-5) and (-1,1) can be found using the formula:
slope = (y2 - y1) / (x2 - x1)
where (x1, y1) = (-6,-5) and (x2, y2) = (-1,1)
slope = (1 - (-5)) / (-1 - (-6)) = 6/5
Now, using point-slope form of the equation of a line, we get:
y - y1 = m(x - x1)
where m = 6/5 and (x1, y1) = (-6,-5)
y + 5 = 6/5(x + 6)
y + 5 = 6/5x + 6.72
y = 6/5x + 6.72 - 5
y = 6/5x + 1.72
Therefore, the equation of the line passing through the points (-6,-5) and (-1,1) is:
y = 6/5x + 1.72
Option (c) y=6/5x is not the correct equation of the line. The correct answer is (d) y=6/5x + 11/6.
7. Levi invests $600 into an account earning 4% annual interest compounded monthly. How much money
will he have in 14 years?
Answer:
Step-by-step explanation:
To solve this question, we can use the formula for compound interest:
A = P(1 + r/n)^(nt)
Where:
A is the total amount of money after t years
P is the initial principal (in this case, $600)
r is the annual interest rate (4%)
n is the number of times the interest is compounded per year (12, for monthly compounding)
t is the number of years
Plugging in the values, we get:
A = 600(1 + 0.04/12)^(12*14)
A = 600(1.00333)^168
A = $988.42 (rounded to two decimal places)
So, after 14 years, Levi will have approximately $988.42 in his account.
8x -4 > 3x -9 respuesta plis
Answer:
x > -1
Step-by-step explanation:
8x - 4 > 3x - 9
5x - 4 > -9
5x > -5
x > -1
HURRY I NEED THIS NOW!!!!!!!!!!!
The domain and range of the function is (-∞, ∞), (-∞, 18]
What is domain and function of a functionA function is a rule that gives each element from the domain set to a single element from the range set. The range is the set of values that the function can take, whereas the domain is the set of values for which the function is defined.
Consider the function f(x) = x^2, for instance. As the function may be defined for any value of x, the domain of this function includes all real numbers. Nevertheless, as the function may only accept values larger than or equal to zero, the range is limited to non-negative real numbers.
a. The domain and range of the function f(x) = -2x² + 8x + 10 are;
domain = (-∞, ∞)
range = (-∞, 18]
b. The domain and range of the function is;
domain = [0, 12]
range = [0, 18]
c. The domain and range of the function are;
domain = (-∞, ∞)
range = [-7, ∞)
d. The domain and range of the function are;
domain = (-∞, ∞)
range = [1, ∞)
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PLEASE HELP!!
Solve and explain
Answer:
Step-by-step explanation:
holy mocacrise
for her party can nina fill fewer than 10 bags with treats between 10 and 20 bags between 20 and 30 bags or more than 30 bags explain 3 treats in each bag 78 treats in all
Answer:
Step-by-step explanation: If Nina fills 10 bags, each with 3 treats, she would have a total of 30 treats (10 bags x 3 treats per bag). If she fills 20 bags, she would have 60 treats (20 bags x 3 treats per bag). If she fills 30 bags, she would have 90 treats (30 bags x 3 treats per bag). Since she only has 78 treats, she can fill between 10 and 20 bags, but not more than 20 bags.
If she fills 10 bags, she would use 30 treats, leaving her with 48 treats. If she fills 11 bags, she would use 33 treats, leaving her with 45 treats, which is not enough to fill another bag. Therefore, she can fill fewer than 11 bags, but not more than 20 bags.
A diver makes 2.5 revolutions on the way from a 10 −m high platform to the water. Assuming zero initial vertical velocity, the average angular velocity during the dive is
a. 5 π/ √2=rad/s
b. 3 π/ √2=rad/s
c. π/ √2=rad/s
d. 5 π/√3=rad/s
The average angular velocity during the dive is option b, 3 π/ √2=rad/s.
The height of the platform, h = 10 m
The number of revolutions made by the diver = 2.5 revolutions = 5π radThe initial velocity of the diver = 0
The final velocity of the diver:
We know,
The formula for final velocity in terms of initial velocity, acceleration, and distance is given as;
v² = u² + 2
Here, Initial velocity, u = 0
Final velocity, v =
Acceleration due to gravity, a = 9.8 m/s²
Distance, s = h = 10 m
Therefore, v² = 0 + 2 × 9.8 × 10v²
= 196v = √196v = 14.00 m/s
We know, the formula for average angular velocity is given as;
ω = θ/t
Here, angular displacement, θ = 5π rad
Time taken, t
We know, the formula for time taken is given as;
t = √2h/g
Here, height of the platform, h = 10 m
Acceleration due to gravity, g = 9.8 m/s²
Therefore,t = √2 × 10/9.8t = 1.427 s
Substituting the values of θ and t in the formula for average angular velocity, we get;
ω = θ/tω = 5π/1.427ω = 3.5 π/ √2rad/s
Therefore, the average angular velocity during the dive is option b, 3 π/ √2=rad/s.
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Milly is making a circular tablecloth of area 2 m². Determine the length of piping she
needs to sew around the outer edge of the tablecloth. (correct to the nearest
0.1 m)
Answer:?
In response to stated question, we may state that You will need to stitch about 5.0089 metres of piping around the outside border of the area tablecloth, rounded to the closest 0.1 m, for a total length of 5.0 m.
What is area?The size of just an area on either a surface can be represented as an area. The area of an open surface or the border of a two half object is called to as the surface area, meanwhile the area of a horizontal region or planar region pertains to the area of a shape or planar layer. The entire amount of space occupied by a horizontal (2-D) surface or form of an item is referred as its area. With a pencil, draw an square on a sheet of paper. A two-dimensional character. The area of a form on paper is the quantity of area it takes up. Consider the square to be made up of smaller unit squares.
Begin by calculating the radius of the circular tablecloth. We know that the formula A = r2 gives the area of a circle, where A is the area and r is the radius. Hence we may rearrange this formula to find r:
r = √(A/π) = √(2/π) ≈ 0.7979 m (rounded to four decimal places) (rounded to four decimal places)
Now we must determine the circumference of the circle, which is the distance around the tablecloth's outside border. The circumference is calculated using the formula C = 2r.
C = 2π(0.7979) ≈ 5.0089 m
You will need to stitch about 5.0089 metres of piping around the outside border of the tablecloth, rounded to the closest 0.1 m, for a total length of 5.0 m.
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IGCSE CIE MATHS
Please answer the question below thank you
As a result, we are unable to determine the age of a child who is 133 cm tall using the regression equation.
what is linear regression?A statistical technique called linear regression is used to represent the connection between two variables, where one of the variables is the dependent variable and the other is the independent variable. Finding the best-fit line that depicts the connection between the two variables is the objective of linear regression. This enables us to make predictions or estimate values based on the known data.
given
These numbers allow us to determine a and b:
a = 0.997 (9.285 / 1.547) ≈ 5.977
b = 128.2 - 5.977 (8.02) ≈ 81.704
The regression equation is therefore y = 5.977 x + 81.704.
(ii) Based on the calculations made above, the Pearson's product-moment correlation coefficient, or r, has a value of roughly 0.997.
(b) We enter x = 9 into the regression equation to calculate an approximation of the height of a 9-year-old child:
As a result, we calculate that a 9-year-old kid will be roughly 134.6 cm tall.
We must resolve the regression equation for x in order to determine the age of a kid who measures 133 cm in height.
x = (y - b) / a
This calculation, though, would result in an illogically negative age. As a result, we are unable to determine the age of a child who is 133 cm tall using the regression equation.
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The complete question is:-
The following table shows the mean height, y cm, of primary school children who are age x years old.
Age, x years Mean Height, y cm
6.25 7.35 8.5 9.25 10.75
115 121 129 136 140
The relationship between x and y can be modelled by the regression line of y on x with equation y = ax + b.
(a) (i) Find the value of a and the value of b.
(ii) Write down the value of Pearson's product-moment correlation coefficient, r.
(b) Use your regression equation from part (a)(i) to estimate the height of a child aged 9 years old.
(c) Explain why it is not appropriate to use the regression equation to estimate the age of a child who is 133 cm tall.