exam Maths Puzzle Numerical Ability

Factor
6b^+7b-20.

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exam Other Question

I cannot get this problem to work out right. Can you please help me solve it step by step? find sin(tan^-1(2/3) and find given that sin a=-8/17, and a is in QIV, find sin(a/2) and cos(a/2), thanks I need help in this area a=angle.