exam Maths Puzzle Numerical Ability

a man born on the 1st century will be x years old in x to the power 2 AD.Find his year of birth.

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exam Other Question

Find the value of k for which x=4 is a solution to the equation 3x + k=23. I have an answer of 20=k. I worked it out but unsure of my answer. Thanks very much for looking at this problem. A farmer needs to put up a square fence around his chicken area. If the area is 91 sq feet, how much fence does he need to buy, rounded to the nearest tenth of a foot?