Which of the following matrices could be used to solve the system of equations?

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?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels