exam Maths Puzzle Numerical Ability

Let f(x)=x+2 and g(x)=x^2-9. Find the following:
(f+g)(x)
(g-f)(5)
f(-4)*g(5)
f(2)/g(0)

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exam Other Question

Graph each of the following equations by first solving for y.

2x - 3y = 12
1/6x^2-25y^2