Help round all THE WAY decimal or fraction form!!

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths

What is the correct decimal form of 12%

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