7. At a certain rate of compound interest, 1 grows to 3 in 2 years, 3 grows to 14 in y years, and 1 grows to 21 in z years. Determine what 5 grows to in (z - 2-y) years. On 1/1/2017, Kelly deposits X into a bank account that pays a simple interest rate of 10% per year. On the same date, Tara deposits X into a different bank account that pays a force of 2t interest & t2 + k From the end of the 4th year until the end of the 8th year, both accounts earn the same dollar amount of interest. Calculate k