What is the midpoint of the line segment joining the points R(5,3) and S(-2,6)?

How can you decide witch operations to use to slice a two step equation

Im literally having a mental breakdown

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?