Matt shoveled snow for 3 hours this week and swam 5 hours. If swimming uses 648 calories and shoveling uses 751 calories per hour, how many calories did Matt use this week?

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

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36