Janette is placing a rectangle in the coordinate plane. She knows that the longer side of the rectangle is 2 times its shorter side. She places the longer side on the x-axis. What coordinates should she assign to the top-right vertex of the rectangle?

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Rectangle in the coordinate plane with vertices at begin ordered pair 0 comma 0 end ordered pair, begin ordered pair 0 comma a end ordered pair and begin ordered pair question mark comma question mark in the upper right.