Solve:
tan^2x/2 - 2cos^2x - 1 for 0

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

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

Acircle has a circumference of 7.850 units. what is its radius?