a family wishes to put an addition on their house. the roof of the addition is rectangular and measures 23 ft. long and 18 ft wide. if roofing costs $3.75 per square foot, how much will the material for a new roof cost?

A manufacturer of cans recieves an order for 11,000 cans with a radius of 8 cm and a height of 17 cm. if the material used in constructing the can costs $0.0002 per cm^2, find the cost of the material used in filling the order