1. How long will it take for $2,000 to grow to $7,000 if the investment earns an interest rate of 12% per year compounded quarterly (i.e., 4 times a year). Exact length of time (without using a calculator), t = ? years Length of time, rounded to 2 decimal places = ? years

2. How long does it take for an investment earning interest at a rate of 18% compounded semiannually (i.e., 2 times a year) to double in value? Exact length of time (without using a calculator), t = ? years Length of time, rounded to 2 decimal places = ? years

3. How long will it take for $3,000 to grow to $8,000 if the investment earns an interest rate of 4% per year compounded continuously. Exact length of time (without using a calculator), t = ? years Length of time, rounded to 2 decimal places = ? years