exam Maths Puzzle Numerical Ability

1/6x^2-25y^2

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exam Other Question

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)
Solve each of the following systems by substitution.
McGraw Hill 6th edition, 8.3 # 20.
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8x-4y=16
y=2x-4