exam Maths Puzzle Numerical Ability

solve and graph y=1/x and its inverse

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exam Other Question

Find the area under the normal distribution curve to the right of z = �1.03.

Can you explain this for me? Let n denote an integer greater than 1. Which of the following statements are true?
i. if 2^n -1 is prime, then n is prime
ii. if n is prime, then 2^n - 1 is prime
iii. if 2^n -