Find the interest rate r at which $740 compounded annually grows to $800 in 2 years.

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

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?