Textbook Problem

Tom Morrow wants to buy some fertilizer for his yard. The lot size is 140 ft by 160 ft. The outside measurements of his house are 80 ft by 35 ft. The driveway measures 30 ft by 20 ft. All shapes are rectangular.

a) What is the square footage of his yard that needs to be fertilized?

b) If each bag of fertilizer covers $5000{\text{ ft}}^2$, how many bags should Tom buy?

c) If the fertilizer costs $18 per bag, what is his total cost?