Some one please help
Find the sum. 1/4(12 + ) +1/2( − 6)

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

Ranck the following in order from least precise to most precise

In the triangle below, what is the length of the side opposite the 60° angle?