book Maths Puzzle Numerical Ability

I have to solve this. Could you please help me out? TKS :)

True or false: The function "f(x) = 3x" grows three times faster than the function "g(x) = x". Explain.

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book Other Question

-3 square root of 12 (4x+5) 10 square root of 3x squared over .5x a local train leaves newark at 8:00am and travels west at an average speed at 40 mi/hr. At 9;00 am an express train leaves Newark on tracks parrallel to the local train and heads