Harding and jack found that 8 percent of their number was 72. what was their number?

I do believe that the answer is 900. 
Steps:
I first set up a proportion, with 8/100 and 72/x (x being the number we are trying to find) 
As I was taught, you multiply 100 by 72, which equals 7,200.
Then, I divided 7,200 by 8, which gave me 900.
This is what the proportion process should have looked like:
8/100    72/x
7,200/8
x=900
I hope this helps!

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2

B.the point lies directly on the regression