Find the mean of the following 8, 12, 16, 10, 18, 15, 22, 16, 14, 17 ​

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Find the value of the variable and the length of each secant segment

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.