The sum of xy times 3 is equal to 3(xy).
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Yes, xy is the same as yx, but should always be written as xy.
Area of a trapezoid = 0.5*(sum of parallel sides)*height
3x+5x
Improved Answer:If: x = -2 and y = -4Then: xy = 8Because: -2 times -4 = 8
It depends on where arc XY is: on a circles, a parabola or some other curve; and what else you know about the curve.