If your right I’ll mark brainiest

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

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?

Solve the system of equations y= 3/2 - 1, -x+ y =-3