Can someone help me with this?

Which table shows a proportional relationship between miles traveled and gas used?

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?

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.