On a cold day the temperature in a certain city changed -23.8 degrees Fahrenheit over 6.8 hours what was the average change in temperature per hour enter your answer as a decimal in the box

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