MAy anyone help me wit this math question

Does anyone know this? the andwer choices are: 79, 85, 101, and 135 degrees!

What are two numbers that have a sum of 15?

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