1.

A parallelogram PQRS with area ( ) has length PQ ( ) units. Given that the distance between the two parallel sides, SR and PQ is ( ) units where a, b and c are integers. Find, without using a calculator, the values of a, b and c.

2.

Given that , y=56 when x=4 and y=20 when x=2.5, find the value of a and b.