Does anybody know how to do this and then can u plz explain it to me and thx

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?