Which example illustrates the commutative property of addition for polynomials? (2x2 + 5x) = –(–2x2 – 5x) (2x2 + 5x) + 0 = (2x2 + 5x) (2x2 + 5x) + (4x2 – 4x) = 2x2 + 5x + 4x2 – 4x (2x2 + 5x) + (4x2 – 4x) = (4x2 – 4x) + (2x2 + 5x)

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters