What is the common ratio of the sequence?
-2,6,-18,54,...
A. -13
B. -2
C. 3
D. 8

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Sketch one cycle if the cosine function y=2cos2theta