-1 + -4 I also need a example thank you everyone for your help

Find the given elements if matrix d:

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?

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)