Answer:
15
Step-by-step explanation:
Let's call the mystery number x.

Hope this helps!
X - Ollie's age
8 is subtracted from Ollie's age = x-8
the result is the same as
subtracting 16 from 3 times his age = 3x-16

Ollie is 4 years old.
Answer:
Step-by-step explanation:
all you have to do is pick to points from the graph and input then in <u>y1-y2 </u>
x1-x2
4.5 x 6.2 = 27.9
Hope that helps