Simplify expression 4(6.8-4.2)+8.2 divided by two

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

Aiko jumped rope for 20 min and stopped at 8: 05 when did she start

Point m is located at (-4, -6). what is located 4 units from point m? ( its on a coordinate plane by the way. )