exam Maths Puzzle Numerical Ability

Given the function f(x) = 5x+2, find a formula for the inverse function.

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exam Other Question

I cannot get this problem to work out right. Can you please help me solve it step by step? when a sound travels through water, the distance y in meters that the sound travels in x seconds is given by the wquation y=1440x.

How far does a soun travel underwater in 5 sec