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subtracting but no negative number pl need it now

Can (2,3 and square root 10) be sides ona right triangle?

Write an equation for the function that includes the points (2,100)and (3,100)

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.