Does the expression 30 + (-23) represent the temperature at night?

Im not good at coordinate graphs but I think the answer is the second one, sorry if I'm wrong!! :)

Answer:

Step-by-step explanation:

You are to assume in both problems that the two triangles are similar. That is a very dangerous assumption -- especially in later math classes. But in this case, there is no other way to do the problem. The two sets of triangles look like they are proportional.  So set up two ratios that are = to each other

On the left

long side small triange / long side large triangle = base small triangle / base large triangle

On the right

hypotenuse/longest leg = hypotenuse / longest leg.

Problem A

Set up the similar Proportion

5/40 = x/20                Cross Multiply

40x = 20*5

40x = 100                   Divide by 40

x = 100/40

x = 2.5

Problem B

Again set up the similar triangle proportion

15/10 = x/2                  Multiply by 2

15*2/10 = x              

3 = x

Answer:

([tex]n^{2}[/tex]+4)-3

Step-by-step explanation:

since it says "and four" i think it means it is in parenthesis

Answer:

n^2 + 1

Step-by-step explanation:

Let the unknown number be n.  Then "a number squared and four" is

n^2 + 4, and 3 fewer than this result is

n^2 + 3 - 3, or n^2 + 1

Answer:

y= -x+2

Step-by-step explanation:

Using the equation, y = mx+b, you know you have to find the slope. Find the slope using two coordinate points, (-2,4) and (0,2).

Subtract 2-4/0+2 - the answer is -1. Your slope is -1 and the y axis is given so the equation is y=-x+2

Answer:

a is right angle

Step-by-step explanation:

Answer:

i don't know ok but today is my math exam

Answer:

$819

Step-by-step explanation:

First we find the area of the wall so we multiply 13ft x 9ft.

13ft x 9ft = 117ft

We know each square foot is equal to $7. So now we multiply 117 x 7 to get the total cost.

117 x 7 = $819

Answer:

240g of 10% salt solution and 160g of 5% salt solution

Step-by-step explanation:

Simpler way:

Let X be the amount of 10% salt solution and Y be the amount of 5% salt solution.

Then X:Y = 3:2 as you need more 10% salt solution than 5% salt solution to create a 8% salt solution. The ratio 3:2 is given as 10 - 8 = 2 and 8-5 = 3.

If X:Y = 3:2 = 60:40, then 60% of the 400g of 8% salt solution must be the 10% solution and 40% of the 400g of 8% salt solution must be the 5% solution. Therefore, 240g of the 10% salt solution and 160g of the 5% salt solution is needed to create 400g of the 8% salt solution.

This is correct as the amount of salt in the solution is equal to (10% X 240g = 24g) + (5% of 160g = 8g). So the total amount (24+8) 32g should be equal to the amount of salt in the 400g of 8% salt solution.

8% of 400g = 32g which means our answer is correct.

More complex way:

A more complex way is to use algebra.

Let X be the amount of 10% salt solution and Y be the amount of 5% salt solution.

X + Y = 400g

and 10% of X + 5% of Y = 8% of 400

so 1/10 X + 1/20 Y = 32

2X + Y = 640 (multiply the previous equation by 20)

Now from the first line we know that X + Y = 400

So if we subtract (2X+Y) by (X+Y) we can get the value of X:

(2X+Y) - (X+Y) = 640 - 400

2X+Y - X - Y = 240

Therefore X = 240

And since X + Y = 400, Y = 160.

Answer: 26

Step-by-step explanation:

mean is the same thing as finding the average

you add up all the numbers then divide by the amount of numbers there are

24+27+31+21+27=130

130\5=26

Answer:

9

Step-by-step explanation:

45/15=x/3

3*3=x

x=9

Answer:

3*5=15 so __*4=45 so answer is 45/5=9

Step-by-step explanation:

Answer:

[tex]2x^3-3x+4+\frac{5}{3x-5}[/tex]

Step-by-step explanation:

Use polynomial; long division to divide the two polynomials. Remember to put each polynomial in standard form, or rather organize each polynomial by their degree (exponent). The polynomial with the highest exponent will go first, then each with its varying exponent will suceed.

          _____[tex]\underline{2x^2\ \ -\ \ 3x\ \ +4}[/tex]

[tex]3x-5[/tex] | [tex]6x^3 - 19x^2+27x-15[/tex]

          [tex]\underline{-6x^3+10x^2}[/tex]

                    [tex]-9x^2+27x[/tex]

                      [tex]\underline{+9x^2-15x}[/tex]

                               [tex]12x-15[/tex]

                               [tex]\underline{-12x+20}[/tex]

                                         [tex]5[/tex]

Answer:

3⁴

Step-by-step explanation:

3*3*3*3 is equal to 3⁴

Answer:

6\8

Step-by-step explanation: Because 3/4 times 2/2 is 6/8

Answer: D

Step-by-step explanation: 15 : 5 is equivalent to 60 : 20 because you multiply both sides by 4

Answer

Because velocity and speed differ each other by direction, in a 100 m sprint race the person moves in a straight path without changing its direction where as in a 400 m race. The person moves in a lap around the race track and the direction changes as he turns according to the race track.

Step-by-step explanation:

<3

Answer:

14

Step-by-step explanation:

5x + 2 + 48 = (180-120)+30 +30

5x+50 = 60+30+30

5x+50=120

5x=120-50

5x = 70

x = 70/5

x = 14

Answer:

1^2 and 2^2

Step-by-step explanation:

1^2 is 1

2^2 is 4

3 is a number in between

Answer:

1 and 4 or [tex]1^{2} and 2^{2}[/tex]

Step-by-step explanation:

[tex]1^{2}[/tex] = 1

[tex]2^{2}[/tex] = 4

The number that comes in between is 1 and 4 is 3.

Answer:

3/8

Step-by-step explanation:

In 1 day = 1/8

In 3 days = 1/8 x 3 = 3/8

Answer:

It is ⅜ hours

Step-by-step explanation:

[tex]{ \sf{1 \: day = \frac{1}{8} \: hours}} \\ \\ { \sf{3 \: days = (3 \times \frac{1}{8} ) \: hours}} \\ \\ = \frac{3}{8} \: hours[/tex]

Answer:

40°

Step-by-step explanation:

Since triangle ABC is identical to triangle A'B'C', it has the same measures of respective sides and angles, and ang A is therefore equal to angle A'.

After rotational transformation, the measure of angle ∠A' = 40°.

A rotation is a transformation that turns the figure in either a clockwise or counterclockwise direction on the coordinate plane. In both transformations the size and shape of the figure stays exactly the same.

For the given situation,

The diagram shows the two triangles.

Triangle ABC is the original triangle and A'B'C' is the triangle obtained after the rotation of -120°.

From the definition, in rotational transformation the size and shape of the figure stays exactly the same. Then the angle measures are also remains the same.

Thus the measure of angle A' is [tex]\angle A' = \angle A = 40[/tex]

Hence we can conclude that after rotational transformation, the measure of angle ∠A' = 40°.

Learn more about rotation transformation here

https://brainly.com/question/12865301

#SPJ2

Answer:

the answer would be C.

Step-by-step explanation:

C is your answer

Answer:

answer b

Step-by-step explanation:

Answer:

21/5

Step-by-step explanation:

Answer:

1 [tex]\frac{1}{40\\}[/tex]

Step-by-step explanation:

i hope this helps :0

Answer:

ee

Step-by-step explanation:

e

Answer:

9)-1=x+19

-x =19+1

-x=20

-x÷-1=20÷-1

x=20.

Answer:

Step-by-step explanation

Answer:

brainliest is appreciated