exam Maths Puzzle Numerical Ability

Find:
sin A if cos A = -(3/5) and 90 degrees < A < 180 degrees

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Can you help me solve this?.....I have to factor this problem...

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x^2-6x-16 Solve.

The longer leg of a right triangle is 3 cm less than twice the shorter leg. The hypotenuse is 18 cm long. Find the length of the shorter leg.