X/3=5/7 what is the value of x show work

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls

Can someone me with these two circle theorem questions asap?

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