exam Maths Puzzle Numerical Ability

a^2(64a^2-3)/3 = 27-4^2/4

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exam Other Question

A math 109 student must solve 270 problems for her college of the air class. If she solves 15 problems in 40 minutes then at this rate, how many hours will it take her to complete all 270 problems? I am stuck on correct answer for:

9x - 7y - x + 4y =

I believe the answer is 8x - 3y. What is correct answer to this?

I am not using any specific book. I am just practicing...