Can the side lengths 10,4,19 make a triangle?

Whats the name of the vertical axis

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

In a fruit survey, 300 children choose their favorite fruit out of apples, bananas, and watermelon. 150 chose apples and 90 chose bananas. what percent chose watermelon?