f(x)=7x+12
Put y in place of f(x).
y=7x+12
Switch x and y.
x=7y+12
Solve for y.
x-12=7y
(x-12)/7=y
Put in the f^-1(x) notation.
f^-1(x)=(x-12)/7
proportionality of triangles- setup and solve
Evaluate 9x^2y^−2 for x = –3 and y = 2.
a)9(−6)^0
b)1/144
c)20 1/4
d)324
Answer:
c)20 1/4
Step-by-step explanation:
[tex]9x^{2}y^{-2}[/tex]
If We replace x by -3 and y by 2 we get :
[tex]9\left( -3\right)^{2} \left( 2\right)^{-2}[/tex]
Or we have :
[tex]\left( -3\right)^{2} =9\ \text{and} \ \left( 2\right)^{-2} =\frac{1}{2^{2}} =\frac{1}{4}[/tex]
then
[tex]9\left( -3\right)^{2} \left( 2\right)^{-2}=9\times9\times\frac{1}{4} = \frac{81}{4}[/tex]
on the other hand :
[tex]\frac{81}{4} =\frac{80+1}{4} =\frac{80}{4} +\frac{1}{4} =20+\frac{1}{4}=20\frac{1}{4}[/tex]
Use your line of best fit from question 5 to find the approximate value of y when x equals 24
The line of best fit is an illustration of a linear regression
Using the assumed parameters, the value of x when x = 24 is 30.75
How to determine the value of y?The equation of the line of best fit is not given, and the parameters to calculate the line of best fit are missing.
So, I will assume the following parameter values.
Assume that the line of best fit passes through the points
(x,y) = (1,2) and (5,7)
The slope of the line would be:
m = (7 - 2)/(5- 1)
m = 1.25
The equation is then calculated as:
y =m(x - x1) + y1
This gives
y = 1.25(x - 1) + 2
Expand
y = 1.25x - 1.25 + 2
Evaluate
y = 1.25x + 0.75
When x = 24, we have:
y = 1.25 * 24 + 0.75
Evaluate
y = 30.75
Using the assumed values, the value of x when x = 24 is 30.75
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Joshua has a ladder that is 12 ft long. He wants to lean the ladder against a vertical wall so that the top of the ladder is 11.8 ft above the ground. For safety reasons, he wants the angle the ladder makes with the ground to be no greater than 75°. Will the ladder be safe at this height? Show your work and draw a diagram to support your answer. ( If you reshare another students answer from brainly or any other websites you'll be reported) Will Mark Brainliest if answered correctly and draw a diagram). Thank you.
We need theta first (angle
[tex]\\ \rm\rightarrowtail sin\theta=\dfrac{P}{H}[/tex]
[tex]\\ \rm\rightarrowtail sin\theta=\dfrac{11.8}{12}[/tex]
[tex]\\ \rm\rightarrowtail sin\theta=0.9834[/tex]
[tex]\\ \rm\rightarrowtail \theta=sin^{-1}(0.9834)[/tex]
[tex]\\ \rm\rightarrowtail \theta=79.54°[/tex]
On rounding it will go till 80°
So it's not safecould yall help me on this pls!!
Answer:
Step-by-step explanation:
Remark
Make a very crude diagram of what these points look like. You will find that
(-8,6) is above (-8,3) (-3,6) is above (-3,3)That gives you a hint about how to find the Length and width.
Givens
From (-8,-3) and (-3, 3) L = -8 - -3 = - 5
From (-8,6) and (-8,3) w = 6 - 3 = 3
Solution
The length cannot be minus 5. The way to get around that is to call it and absolute value of (-5) which is 5
So the area = L*W
area = 5 *3
area = 15
Answer
Area = 15
5 power 2x = 1/125. find the value of x.
Answer:
x = -3/2
Step-by-step explanation:
note: 1/125 can be written as 5 exponent -3 thus, 5^-3
Expressing it in this form, we can rewrite the above equation as
5^2x = 5^-3
As part of the laws of indices and logarithms, when the bases are the same and they are equating, You equate only the exponents
therefore, we have;
2x = -3
divide through by 2
x = -3/2
Eddie's dog weighs 31.8 kilograms. How many grams are equivalent to 31.8 kilograms?
A: 0318 grams
B: 318 grams
C: 3,180 grams
D: 31,800 grams
Answer:
D
Step-by-step explanation:
to find the value in grams, we just multiply by a 1000
so, 31.8 × 1000 = 31,800 grams
I need help on number 9
Answer:
3. -1/3 ± 2i√5 / 3
Step-by-step explanation:
3x^2 + 2x = -7
Divide through by 3:
x^2 + 2/3 x = -7/3
Completing the square:
x^2 + 2/3 x + (1/3)^2 = -7/3 + (1/3)^2
(x + 1/3)^2 = -7/3 + 1/9
(x + 1/3)^2 = -20/9
x + 1/3 = ±√(-20) / 3
x + 1/3 = ± 2√-5/3
x = -1/3 ± 2i√5 / 3
Can somebody help me round 376.77 to the nearest whole. With steps (guidance)
It would totally help me with the state exam tomorrow!
Answer:
To round 376.77 to the nearest dollar consider the tenths’ value of 376.77, which is 7 and equal or more than 5. Therefore, we have to round the amount up: the dollar part of 376.77, 376, increases by 1 to 377, and the decimal point and all digits (.77) are removed.
Step-by-step explanation:
How could you have simplified this problem in 2 different ways
[tex]( 7 . 3^{6} ) ^{4}[/tex]Answer:
= [tex](7^{-3--2}[/tex] x [tex]3^{-8--2} ) ^{-4}[/tex]
= [tex](7^{-1}[/tex] x [tex]3^{-6}) ^{-4}[/tex]
= [tex]( 7^{1}[/tex] x [tex]3^{6}) ^{4}[/tex]
= [tex]7^{4}[/tex] x [tex]3^{24}[/tex]
OR
= [tex](\frac{3^{-8} }{7 . 3^{-2} }) ^{-4}[/tex]
= [tex](\frac{1}{7 . 3^{6} } ) ^{-4}[/tex]
= [tex]( 7 . 3^{6} ) ^{4}[/tex]
= [tex]7^{4}[/tex] x [tex]3^{24}[/tex]
Step-by-step explanation:
What will a $140,000 house cost 7 years from now if the price appreciation for homes over that period averages 7% compounded annually?
The future cost of the house will be $___
(Round to the nearest cent as needed.)
The house will cost approximately $246,359.85 seven years from now.
What is compound interest?It is the interest we earned on the interest.
The formula for the amount earned with compound interest after n years is given as:
A = P [tex](1 + r/n)^{nt}[/tex]
P = principal
R = rate
t = time in years
n = number of times compounded in a year.
We have,
In this problem,
P = $140,000
r = 0.07
n = 1 (compounded annually)
t = 7.
Plugging in these values.
A = $140,000 (1 + 0.07/1)^(1 x 7)
A = $140,000 (1.07)^7
A = $246,359.85
Therefore,
The house will cost approximately $246,359.85 seven years from now.
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What is the volume of a right cylinder
with a radius of 14 units and a height
of 31 units?
Answer:
6076π ≈ 19088.3 cubic units
Step-by-step explanation:
The volume of a cylinder is found using the formula ...
V = πr²h
__
For the given dimensions, the volume is ...
V = π(14²)(31) = 6076π ≈ 19088.3 . . . cubic units
Identify the polynomial that is the difference of two squares.
A. 25m2 − 16n
B. 49m2 − 81n4
C. 36m2 − 8n8
D. 9m2 − 5n6
Answer:
Option B, [tex]49m^2 - 81n^4[/tex]
Step-by-step explanation:
Step 1: Determine the difference of two squares
According to online, "In mathematics, the difference of two squares is a squared number subtracted from another squared number. Every difference of squares may be factored according to the identity a^2-b^2 = in elementary algebra." a^2 - b^2 gives us (a + b)(a - b)
The only one that would work is Option B so lets factor it out.
[tex]49m^2 - 81n^4[/tex]
[tex](7m + 9n^2)(7m - 9n^2)[/tex]
Answer: Option B, [tex]49m^2 - 81n^4[/tex]
A package of 6 pencils costs $3. The cost per pencil is $.
Answer:
Each pencil costs 50 cents
Step-by-step explanation:
Step 1: Determine the price per unit
(Price of Items) / (Amount of items)
($3) / (6)
$0.5
Answer: Each pencil costs 50 cents
Vectors U and V are shown on the graph (The graph with letters U and V)
Which of the following vectors represents u-v
Answer:
see attached
Step-by-step explanation:
The vector difference u -v can be represented on a vector diagram by the sum u +(-v), where -v is a vector the same length as v, but in the opposite direction.
__
This sum is shown in the attachment.
please help! thank you!
Step-by-step explanation:
p(p-q) - q(q-p)
p²-pq - q² +pq
p² - q²
Choice 1
PLEASE HELP
Bobby invests $2500 and wants it to grow to $5000, what interest rate will double your money in 5 years? (round to nearest tenth - one decimal space)
Answer:
14.9 %
Step-by-step explanation:
2 = double
2 = ( 1+ i)^5 i = interest in decimal 5 = years
i = .149 = 14.9 %
one more than nineteen
And in numerical form, 20
Answer:
20
Step-by-step explanation:
first yo get the number 19 then after that you can add 1 and your answer is 20 and aafter 20 (just incase you want to know) is 21
What is the surface area of this right prism?
1050 in²
1200 in²
1440 in²
1800 in²
Answer:
The anwer is B 1200 in
Step-by-step explanation:
455 rounded to the nearest ten
Answer:
it's 460 I think, because the last number is a five so if it's over a five you round up
Genetics, stress and_________can also have an impact on the health of the cardiovascular system.
A. attitude
C. lifestyle
Answer:
C. lifestyle
Step-by-step explanation:
Hope this helps!
Help help help math math
Answer:
-6x-10
Step-by-step explanation:
you multiply 3x by -2
and 5 by -2
never forget the negative
Kristen made a floor plan for her dog's kennel. The floor plan is shown below.
Note: Figure is not drawn to scale.
If a = 56 in, b = 22 in, c = 73 in, and d = 25 in, what is the perimeter of the floor plan?
A.
346 in
B.
240 in
C.
302 in
D.
256 in
Answer:
346in
Step-by-step explanation:
[tex]\hookrightarrow Here,\\\\\hookrightarrow a=56 in, b = 22 in, c = 73 in, and d = 25 in\\\\Now,\\\\\hookrightarrow Perimeter=Sum\:of\:all\:sides\\\\\hookrightarrow Perimeter=a+b+b+d+(c-2d)+b+d+b+a+c\\\\\hookrightarrow Perimeter=56+25+22+22+(73-25-25)+22+25+22+56+73\\\\\hookrightarrow Perimeter=346in[/tex]
Please help me 50 points!!!!!
Answer:
1 trapezoid
2 triangle
3 rectangle
Use the graph of the function to find, 4-6).
Answer:
D. 3Step-by-step explanation:
f(-6) is the corresponding number of -6 and you can spot it on the y-axis
When the graph of any continuous function y = f(x) for a ≤ x ≤ b is rotated about the horizontal line y = L, the volume obtained depends on L. What value of L minimizes the volume in part (c)?
The value in the part (c) is 1/(b-a) if the graph of any continuous function y = f(x) for a ≤ x ≤ b is rotated about the horizontal line y = L, the volume obtained depends on L.
What is integration?It is defined as the mathematical calculation by which we can sum up all the smaller parts into a unit.
We have a graph of any continuous function y = f(x) for a ≤ x ≤ b is rotated about the horizontal line y = L.
For part(c)
[tex]\rm V(L) = \int\limits^b_a {\pi(f(x) -L)^2} \, dx\\\\\rm V(L) = \int\limits^b_a {\pi((f(x))^2 -2f(x)+L^2)} \, dx\\\\\rm V(L) = \pi \int\limits^b_a {(f(x))^2} \, dx-2\pi L \int\limits^b_a {f(x)} \, dx +L^2\pi\int\limits^b_a {} \, dx[/tex]
Now finding V'(L)
[tex]\rm V'(L) = -2\pi \int\limits^b_a {f(x)} \, dx+2\pi L \int\limits^b_a {} \, dx[/tex]
[tex]\rm V'(L) = -2\pi \int\limits^b_a {f(x)} \, dx+2\pi L (b-a)[/tex]
Now equation V'(L) to zero; V'(L) = 0
[tex]\rm -2\pi \int\limits^b_a {f(x)} \, dx+2\pi L (b-a)=0[/tex]
[tex]\rm \int\limits^b_a {f(x)} \, dx= L (b-a)[/tex]
[tex]\rm L = \frac{1}{b-a} \int\limits^b_a {f(x)} \, dx[/tex]
The above expression is representing the critical point.
Now finding V''(L)
V''(L) = 2π(b-a) >0 at L
[tex]\rm L = \frac{1}{b-a} \int\limits^b_a {f(x)} \, dx[/tex] (minimizines the volume)
Thus, the value in the part (c) is 1/(b-a) if the graph of any continuous function y = f(x) for a ≤ x ≤ b is rotated about the horizontal line y = L, the volume obtained depends on L.
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Write an equation for a line that passes through points (-6, 1), (1, 4), (5, 6)
Answer:
y= .45x + 11/3
Step-by-step explanation:
Those points are not on the same line but you can get pretty close with
y= .45x + 11/3
What is the radius of a circle that has a circumference of 3.14 meters?
circumference= 3.14m
to find:the radius of the circle
solution:Circumference of a circle = 2πr
Given, circumference = 3.14 meters
Therefore:
2πr = Circumference of a circle
2πr = 3.14
2 × 3.14r = 3.14,[Putting the value of pi (π) = 3.14]
6.28r = 3.14
r = 3.14/6.28
r = 0.5
Select the correct answer.
Rewrite the following expression.
ANSWERS FOR THESE TWO!!
Answer:
x = 4 or x = -3
-1
Step-by-step explanation:
26.
x² = x + 12
x² - x - 12 = 0
(x - 4)(x + 3) = 0
x - 4 = 0 or x + 3 = 0
x = 4 or x = -3
27.
(-6 + 4)/2 = -2/2 = -1