Rectangle: L = 90 ft, W = 65 ft find the perimeter.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

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