Question 553171
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The area of a parallelogram is the measure of the altitude times the measure of the side to which the altitude is drawn, so:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x(x\ -\ 3)\ =\ 40]


So solve


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x^2\ -\ 3x\ -\ 40\ =\ 0]


for the positive root.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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