Help please will mark

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?

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?

Solve: 3x+y=6 4x-2y=18 show all work !