Marco’s bank statement says that he has an ending balance of $81. What is Marco’s starting balance?

Geometry answer picture question pls . reason and statements

What is the radius of the cone in the diagram? round your answer to the nearest whole number

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