Arectangular doormat is 21 inches long and has an area of 714 square inches. find its width

Find the vertex of the function given below y=x^2-6x+1

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.