Book Maths Puzzle Trigonometry

A golfer hits a ball that reaches a height of 24 metres after 2 seconds. If the ball stays in the air for a total of 6 seconds, what was its maximum height?

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Jay gave away 1/2 of his money on Monday. He then gave away 1/3 of what was left on Tuesday. On Wednesday he spend 1/4 of his remaining money. What fraction of his original money does he have left? Im working with the pythagorean theorem how do you solve for c if a = 12 and b = 15 so far ive got to 12^2 + 15^2 = c squared