You plan to build a cylindrical container with no top. the material used for the lateral sides costs $4 per square foot while the material for the bottom costs $5 per square foot.
a) express the total cost of building the cylinder, c in terms of the cylinder's radius, r, and height, h.
c=
b) if the volume of the cylindrical container is 250 cubic feet, express the total cost of building the cylinder, c in terms of the cylinder's radius, r.
c(r)=