Find an equation equivalent to x2 - y2 = 4 in polar coordinates. a. cos2 (theta) - sin2 (theta) = 4r
c. r cos2(theta) = 4
b. cos2 (theta) - sin2 (theta) = 4
d. r2 cos2(theta) = 4  
Please select the best answer from the choices provided​

Which of the following expressions is equal to 2x^2+8

1. a parachutist is 800 feet above the ground when she opens her parachute. she then falls at a constant rate of 5 feet per second. select the equation that represents this situation. h = -800t + 5 y = -5x + 800 h = 5t - 800 y = 800x + 5 i need

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 .