PLZ HELP 100 POINTS AND DUE TODAY I WILL BE SO GRATEFUL!!

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 pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.