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if x=3y, then a=?

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

Graph the equation by plotting point x=2

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown