exam Maths Puzzle Numerical Ability

determine f(g(x)) and g(f(x)) and whether these two functions are inverse of each other, where f(x)=6x and g(x)=x/6.

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exam Other Question

100s2-9=0

Im really confused and I have to solve this by factoring.
find the common roots of the equations;
x^4+5x^3-x^2-5x=0 and x^3+4x^2-x-4=0