Find the measure of angle b (show work)

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Solve 2 - 3 cos x = 5 + 3 cos x for 0° ≤ x ≤ 180° a. 150° b. 30° c. 60° d. 120°

Which is an x-intercept of the graphed function? (0, 4) (–1, 0) (4, 0) (0, –1)