exam Maths Puzzle Numerical Ability

Reduce the fractions to lowest terms.
x^3+x^2+x+1/x^2-1

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exam Other Question

The scores on a multiple-choice test taken by 2000 students were normally distributed with a mean of 60 and a standard deviation of 6. Find the z-score corresponding to the test sc i need some help solving this equation and if possible expressing my answer as an ordered pair

2x-4y=8
x-2y=4

thank you