The formula r equals the square root of A over P minus 1 gives the interest rate r, expressed as a decimal that will allow principal P to grow into amount A in two years, if the interest is compounded
annually. Suppose you have $425 to deposit into an account. Find the interest rate you would need to have $470 in the account at the end of the second year.
0.052%
105%
O 5.2%
5.4%

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.