Please help with 5-5

TIME FOR A LUMP SUM TO DOUBLE If you deposit money today in an account that pays 6.5% annual interest, how long will it take to double your money? TIME TO REACH A FINANCIAL GOAL You have $42,180.53 in a brokerage account, and plan to deposit an additional $5,000 at the end of every future year until your account totals $250,000. You expect to cam 12% annually on the account. How many years will it take to reach your goal