exam Maths Puzzle Numerical Ability

what is domain of this

a)2x
b)2 / (x(x+3)squared 2)

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exam Other Question

Express using a positive exponent.

1/y^-7 This is supposed to look like a fraction with a negative exponent. value of the function g(x) = -5x + 2 when g(5x + 1)

Thanks Kevin