book Maths Puzzle Numerical Ability

True or false, the function f(x) =3x
grows three times faster than the function g(x)=X

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book Other Question

Bill is 1 year less than twice as old as his sister Caroline.
The total of their ages is 26.
How old is Bill now? Please help!
Thanks1 Solve log2(x+2) = log2^3x.