exam Maths Puzzle Numerical Ability

Let f(x)=x^2+4, and g(x)=x-1 Compute (g 0 f)(x), (f 0 G)(x)

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Please help me!!!
How do I simplify this equation.
-12-|7-11|-[3-(-9)]
PLEASE HELP!!! Please Help I need to graph these problems. y=2x+3 y=2thirdx y=3fourthx+2 y=2thirdx-3