Is someone really good at math I need help with my math test

Factor the polynomial expression x6 – x3 – 20

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

Solve for the equation x. 2x + 22 = 4(x + 3)