Answer:
7z
Step-by-step explanation:
subtracting a negative is like adding

First thing to do is set up your equation:
45/x = 20/100
Cross multiply
4500 = 20x
And divide by 20
Answer: 225 people were surveyed
Put the number over each the total that was added then, divide the bottom number to into the top number
Answer:
a^2-1
Step-by-step explanation:
(a+1)(a-1)
=a^2-1
Size bc it’s 8 numbers away