2s+(-4s) combine the like terms to make a simpler expression

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?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Is there an x intercept in the equation 60*1.15^x