Pat borrowed $2,000 to pay college expenses. the interest rate was 5% annually, and she will repay the loan in 4 years. how much total interest will she pay during the 4 years?

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.