Need help with this question with all three parts

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?

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Which of the choices shown could be used to prove that aacp=abcp ?