exam Maths Puzzle Numerical Ability

Can you please help me figure how to solve this question.

Solve for b. a = 1/2bc2

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exam Other Question

SOLVE: -9n+18+11n=38 Perform the indicated operation:

a. (8x^3-3x^2+7x-5)+(-2x^3-3x-10)

b. (8x^3-3x^2+7x-5)-(-2x^3-3x-10)