Can somebody pls help !!

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.