Average rate of change is delta y / delta x
(f(5)-f(1))/(5-1)
(75-3)/4
72/4
18
-2=-1/6(3)+b
-2=-0.5+b
-1.5+b
y=-1/6 -0.5
The volume of the box when it's filled to 3 inches deep is 12×8×3 = 288 in³
The box is filled up to 1.5 inches from the top, that means the box is filled only
3-1.5 = 1.5 inches deep
The volume of the box when it's filled to 1.5 inches deep is 12×8×1.5 = 144 in³
The number of flours saved is 288 - 144 = 144 in³
I believe the percent decrease is 20%
as when you multiply 65.5 by 20%
it gives you 13.1
when you minus 13.1 from 65.50
it gives you $52.4
