Jennifer invests a sum of money in a retirement account with a fixed annual interest rate of 4.30% compounded 12 times per year. after 20 years, the balance reaches $16,604.02. what was the amount of the initial investment?

Carlos has 4/5 of a tank of fuel in his car. he uses 1/10 of a tank per day. how many days will his fuel last?

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels