Hello, Magentarita!

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: . .[1]

The surface area is: . .[2]

Substitute [1] into [2]: .

Therefore: .

If(b) How much material is required for a base 1 ft by 1 ft?