exam Maths Puzzle Numerical Ability

Find the mean and the median.
-8, -1, 3, 9, 15, 18

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exam Other Question

b. A rectangular parking lot is 100 ft longer than it is wide. Determine the dimensions of the parking lot if it measures 500 ft diagonally. HELP!! I have been doing this for twenty-five minutes please help?

(6*10^2)(3.2*10^2)
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(1.6*10^7)(3*10^2)