Simplify
21x^6y^5
14x^2y^9
PLEASE HELPP
second time asking

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3

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