EXPERTS HELP!!SUPER HARD QUESTION

Multiply. write your answer in simplest form. 3/8 x 5/7

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

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