Which is the unit of measurement for volume

How can we find the measure of an exterior angle if we know the measurement of an interior angle

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?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1