Can any help with this Q23 please

He concluded that a heavier object dropped from the same height as a lighter object will land

What is the value of the expression below? 148+(-6)| + |– 35= 7|

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