book Maths Puzzle Numerical Ability

Where ym is the time in sec needed to win for men, with x the Olympic year and x=0 corresponding to 1900. Find the year in which ym = 42.458

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My question says to solve the equation and check the solution.
square root of x=15

Could you help me with this? thanks!
Ronnie invested P dollars in a 2 year CD with an annual rate of return or r. After the CD rolled over three times, its values was P((1+r)^2)^3. Which law of exponents can be sued