exam Maths Puzzle Numerical Ability

The shorter parallel side of a trapezoid is equal to its height and the longer side is 3/2 times as long. If the area is 80, find the lengh of the shorter side.

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Add 8a - 6 and 4a + 5. Consider the points A(0,2), B(-6,4) and the line L1, with equation 3y-x-12=0.
(a) Find the equation of the circle C whose center is the point of intersection of the line L1, and