The kings ship sank with 8 gold bars aboard. the king paid captain nemo 4/5 of one bar for finding the gold. the captain gave 1/2 of his gold to charity. what fraction of a bar went to charity?

Question and answers are in the attached picture. you so much in advance.

Explain how you can use the associative property to evaluate (7x50)x4.

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