Y=x^2-4 solve the quadratic equation

The amount of energy it takes to lift a box might be a function of which of the following

Yvaries directly as x. y =90 when x=6. find y when x=13

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