exam Maths Puzzle Numerical Ability

Find the mean and the median.
-6, -3, 1, 5, 9, 18

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exam Other Question

a rectangular lot has an area of 860 square yards. if the lenght of the lot is 43 yards, find the width and the perimeter of the lot. How do you solve (x+b)(x-b)=x(x-5) for x? I would like to see every step and it would be nice if you could explain why you did each step. Thank you very much.