A triangle is rotated 90° about the origin. Which rule describes the transformation? O (x, y) (-x,-y)
O (x, y) (-y, x)
O (x, y) (-y,-x)
O (x, y) → (y, -x)

What situation is an example of an observational study

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39