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

Your cousin is 26 yrs older than your sister. The product of their ages is 560. How old is your sister? number problem.
You have at least $30.00 in change in your drawer, sonsiting of dimes and quarters. Write an inequality that shows the different number of coins in your drawer.