175 points If I invest $5,000 in a stock market index and it averages 9% per year, how long until I double my investment? (Assume annual compounding) Round answer to the nearest year, do not type the word years Type your answer... 18 5 points What rate of interest must I earn to have $15,000 grow to $25,000 in 5 years? (Assume annual compounding) Round to the nearest whole percent, do not include a \% sign. (For example 17.4% would be 17 and 17.5% would be 18) Type your answer... 19 points I currently have $7,000 in a savings account and add $500 per month, and the account earns 4% compounded monthly. How many months will it take to have $20,000 in this account to purchase a car? Round to the nearest month Type your answer... 5 points What semiannually compounded annual interest rate would $4,500 have to earn to grow to $10,000 in 10 years? Round to the nearest tenth of a percent, do not include a \% sign. (For example 17.42\% would be 17.4 and 17.45% would be 17.5) Type your