Which relation is a function?
A. {(-5, 1), (4,9), (6, 10)}
B.{(0, 3), (0, 9), (12,-4)
C.{-2, 10), (-6, 10), (-2,3)}
D.{(5, 5), (5,9), (5, 15)}

Sketch one cycle if the cosine function y=2cos2theta

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

Thee blue triangle has rotated from quadrant i to quadrant iii about the origin. describe the effects of the rotation on the coordinates of the blue triangle.