exam Maths Puzzle Numerical Ability

What is a better way i can study with little amout of time left of the day?

THANKS,BRITTNEY.

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exam Other Question

x squared - 6= 0 Given that (3x-a)(x-2)(x-7) = 3x^3-32x^2=81x-70, determine the value of a. My answer came out to be 3, but not sure of my answer. thanks for looking over my answer.