Which statement is true? A Angle 2 and angle 4 are vertical angles. B. Angle 3 and angle 6 are complementary angles. C. Angle 1 and angle 2 are supplementary angles. D. Angle 1 and angle 5 are complementary angles,​

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

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.

What is the answer to this equation? and if you can, find a way to show your work.