Answer:
9
Step-by-step explanation:
Create a proportion
84 divide by what gives you 12? 7
So divide 63 by 7, and you get 9.
This doesn't work with all of these problems so you can always cross multiply then divide.
12(63) = 756
84(x) = 84x
84x = 756
84x/84 = 756/84
x = 9
(-4.25 + 2.5)/2 = -1.75/2 = -0.875
C is correct
X^2-7x-8
steps:
x*x
x*1
-8*x
-8*1