What is 7 and a half divided by 1 and one half

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Write as a product: ac^2–ad+c^3–cd–bc^2+bd

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