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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CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:

IF g(x) = 3f(x) AND f(13) = 12, THEN g(13)= Merlin has 20 coins in quarters and dimes. The total value of the coins is $3.95. How many coins of each kind does he have?