Geometry worksheet please help

For how answer my question this will be the last question can you answer in math subject

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

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?