Use the function described below to answer questions 1 - 4.

yvonne invested $4,000 in a savings account which pays 3.5% interest compounded annually. use the formula a = p(1 + r)t, where p is the principal, r is the interest rate, and t is the time in years.
1. approximately, how much money will yvonne have in 4 years? round to the nearest cent.
2. approximately, how much money will yvonne have in 8 years? round to the nearest cent.
3. approximately, how many years will it take for yvonne to double her money? write the number of years only.

4 alex buys a top of the line computer. he did not realize that the computer would lose value so fast. if his computer cost $1800.00 and it depreciates at a rate of 45% each year, in how many years will it be worth less than 1/3 of what he paid for it?