Two right rectangular prisms are shown below

If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?