What is the area of the following parallelogram in square centimeters? A. 60 cm 2
B. 75 cm 2
C. 6 cm 2
D. 7.5 cm 2

Could somebody me with this radical simplification?

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

What is the missing justification in the proof of the pythagorean identity below, sin^2x+cos^2x=1, using a right triangle?