exam Maths Puzzle Numerical Ability

f(x)=-3x+2 and g(x)=2x+9: find (g*f)(x)
thank you

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exam Other Question

Please solve:
n+2(7+3n)-3n
which has the same value:
2(7+n)
n+14
14+3n
2(7+2n)
21n-3n

my answer is 2(7+2n) which will work out to be: 4n+14.
is this correct?
thanks. Find the distance between (-3,-2) and (1,4), simplify form