Use your knowledge of the unit circle to evaluate the following trigonometric expression.
cos 120°
A.-1/4
B.1/2
C.-1/2
D.-1/3

Volume of a cylinder with a radius of 13 in and height of 30 in

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.