Mercedes has a spool containing 15 2 3 inches of ribbon. she cuts a length of 6 1 2 inches to tie a bow. how much ribbon is left on the spool?

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