exam Maths Puzzle Numerical Ability

Given f(x)=5x+7 and g(x)=x^2+7, find (g f)(x).

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exam Other Question

Simplify (9x^4y^2y^-8w^0)^1/2 divided by (125x^-6y^-3y^0)^1/3 I have to solve for x.
a/3 = x/21