Help me answer these for brainest IT MUST BE CORRECT:)

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 graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base