A closed box with a square base is required to have a volume of 10 ft³
(a) Express the amount of material used to make such a box
as a function of the length of a side of the square base.Code:*-----* / /| / / | y *-----* | | | * y | | / | |/ x *-----* x
The volume is 10 ft³: . .
The surface area is: . .
Substitute  into : .
If(b) How much material is required for a base 1 ft by 1 ft?