exam Maths Puzzle Numerical Ability

Could you help me please?Tutor my division is: (3x^3+4x^2-4x-6)/(x-1)

would this be 16- 8? Does x=8? thank you

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Find the average of three test scores if the first two test scores are 80 and 84. Express your answer in terms of s, the third test score write the verbal sentence as an equation or an inequality: a number a divided by two is greater than five