exam Maths Puzzle Numerical Ability

A triangle has an area of 28 square inches. The base of the triangle is 6 inches less than twice the height. What is the length of the base of the triangle?

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I did not reliaze it but there is a second part to the question so I am resubmitted it all at this time. the questions is
The solutions of line a are (3, 3), (5, 5), (15, 15), (3
Please help me with this problem:

Simplify the expression:

sqrt (x) times ^3 sqrt (x)