exam Maths Puzzle Numerical Ability

What is the domain of f(X)= XSquared + 4

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exam Other Question

Um...
whats the answer to:

Let g(x)=4x-5
g(x) when x=2

I NEED THIS ANSWER ASAP PLEASE!!! YOU ARE MY LAST HOPE!!! if a varies directly as band a=16 when b=-8, what is b when a=4