Hello, I am confused with this problem .

A storage shed is to be built in the shape of a box with a square base. It is to have a volume of 1458 cubic feet. The concrete for the base costs $2 per square foot, the material for the roof costs $4 per square foot, and the material for the Sides costs $1.50 per square foot. Find the dimensions of the most economical shed. The length of one side of the shed's base is ft. The height of the shed is It