book Maths Puzzle Numerical Ability

determine whether the following set is a function and justify your answer

{(2,5), (4,6), (-2, 5)}

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book Other Question

I have a few questions:

What is the remainder when (6x^3 + 9x^2 - 6x + 2) ÷ (x + 2)?

What is the remainder when (x^3 - x^2 - 5x - 3) ÷ (x + 1)?

What are the factors of x^3
find the exact value of sin 75 degrees.