exam Maths Puzzle Numerical Ability

What is the length and width of three different rectangles that have an area of 24cm squared (24cm2)?

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exam Other Question

A simple random sample is to be drawn from a population of 1200, in order to have 90%confidence that the sampling error in estimating "n"is no more the 0.03, what sample size will be necessary?

P.S. I just ca not get this one and I have tryed. Is sqrt 121 rational or irrational? Thank you for your help, and you do a wonderful job giving very great details for the problems!