What is the type of two-dimensional solid created by a vertical cross section of the cone that passes through the apex? what is the area of the cross section?

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

Which of the following is the result of expanding the series

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .