MATHEMATICS MIDDLE SCHOOL

I need help plz!
Math

Answers

Answer 1
Answer: For this question, you can find the missing side length by using the Pythagorean Theorem: c² = a² + b²

The two side lengths you are given are 5 cm and 12 cm. 
c² = 5² + 12²
c²= 25 + 144
c² = 169

Then find the square root of 169.

c= 13

Therefore the length of c is 13 cm.

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A branch of mathematics that uses variables

Answers

I would think that algebra is. It uses variables. Don't take my word for it, but I'm pretty sure it is that. Hope this helps ^-^
quadratic expressions use variables and they are a branch of math

The Beach Hut purchased a supply of sunglasses and visors. The ratio of sunglasses to visors was 7:4. Each pair of sunglasses cost $6.00, each visor cost $4.50, and the total bill was $720. How many pairs of sunglasses were purchased?

Answers

hi, i think is like this:    7. 65.45 =458.15
 
7x +4x + 720              4 . 65.45 = 261.80
11x = 720
x = 720/11
x=65.45

Use transformations to solve the equation. y/6 = -2 A. y = –12

B. y = –3

C. y = 3

D. y = 12

Answers

y/6 = -2

y = -2x6

y = -12

30% of 60 is

30%of ____ is 60

Answers

you know that 3 times 2 is 6 so 30'times 20 equals 60

Answer:

Step-by-step explanation:

What is (2n + 20) + 60 = 90?

Answers

(2n +20) +60 = 90
               -60    -60
2n+20= 30
    -20    -20
2n=10
divide by two on both sides
n=5
2n+20+60=902n+80 =902n+80 =9080 -802n =102 2n =5

A ball is thrown into the air from a height of 9cm above the ground, and its height is given by S=128+32t-16t^2, where t is the time in seconds1) find the values of t that makes S=0.
2) Do both of the values of t have meaning for this application? Explain why

Answers

-16t² + 32t + 128 = 0
-16t² + 64t - 32t + 128 = 0
-16t(t - 4) - 32(t - 4)
(-16t - 32)(t - 4) = 0
-16t -32 = 0      t - 4 = 0
-16t = 32          t = 4
t = -2

t = -2 and t = 4 are the values that makes S = 0.
Yes, because if you apply either of  these values alone, S will be 0.
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