exam Maths Puzzle Numerical Ability

1/4(8y+4)-17=1/2(4y-8)

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exam Other Question

Can you help me find the answer for this equation :(x-3)(5x+1) Given: Ray AO is perpendicular to Ray CO
Prove: angle 1 and angle 3 are complementary angles
I have tried different things, but I do not understand this problem.