exam Maths Puzzle Numerical Ability

can you please help me with: (((n(3)-27 over n-3)))

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exam Other Question

Please help w/ the following:

Use the substitution method to solve this nonlinear system:

{{{y=x^2-2x+1}}}
{{{y+x=3}}}

Thank you. given: f(x)=x^2+3 and g(x)(sqrt)2-x find f o g (x)

a.5-x
b. 1-x
c. (sqrt) 5-x^3
d. 7+x^2

Thanks