exam Maths Puzzle Numerical Ability

Evaluate a(b+c) if a = 9, b = 3, and c = 7.

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exam Other Question

Would you please explain to me what this means. I have no idea where to start because the identities I know of do not have cos and csc in one equation. Do I use two identites? H how do you factor this polynomial x^2+14x+24