exam Maths Puzzle Numerical Ability

If f(x) = 3x + 1, and g(x) = (x^2 + 5x )^-1/2, can someone help me find g(f(x))???

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DIVIDE: - 40/-8 can someone please offer there intellegince?
16. Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?
A) 8
B) 10
C) 12
D) 14