Good morning! May somebody help me as soon as possible

5500 dollars is placed in an account with an annual interest rate of 6.5%. to the nearest tenth of a year, how long will it take for the account value to reach 19700 dollars?

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?