A rectangular box is to have a square base and a volume of 40ft3. If the material for the base costs $0.35 per squarefoot, the material for the sides costs $0.05 per square foot, andthe material for the top costs $0.15 per square foot, determine thedimensions of the box that can be constructed at minimum cost.
= Length
Width
Height
how do i find length width and height
