Fill in the measures of the missing angles- HELP

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 midpoint m of z1=(8+5i) and z2=(12+3i)

Find the amplitude of a sinusoidal function that models this temperature variation