Which statement shows the associative property of addition? (u + 7) + 13 = u + (7 + 13) if m + 3 = 18, then 18 = m + 3. 3⋅(5⋅x)=(3⋅5)⋅x 21 + 2y = 2y + 21

Abcd is a parallelogram. the diagram is not drawn to scale. if m

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2

Two line segments are shown in the figure below. suppose that the length of the line along the x-axis is 6, and the length of the hypotenuse of the triangle is 10. what is the equation of the hypotenuse line (shown in red, below)?