Find the reference angle for ?. ? = -81°
A. 81°
B. 171°
C. -81°
D. 126°
Answer: A
You might also like to view...
Find principal to the nearest dollar, rate to the nearest tenth of a percent, or time to the nearest day. Use banker's interest.Hank Wilkins invested $4,400 in a mutual fund containing bonds. Find the rate given that he earned 
in 300 days.
A. 9% B. 9.5% C. 9.8% D. 8.5%
Solve the inequality and graph. Express your answer in interval notation.4x - 4 > 3x - 1
A. [3, ?)
B. (3, ?)
C. (-5, ?)
D. (-?, 3]
Solve the problem.A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of 80 ft/sec, and the gorge is 96 ft deep, during what interval can the flare be seen? 
A. 6 < t < 7 (seconds) B. 4 < t < 5 (seconds) C. 2 < t < 3 (seconds) D. 0 < t < 2 (seconds)
Factor completely. If the polynomial cannot be factored, say it is prime.x3 + 24x2 + 144x
A. x(x + 12)(x - 12) B. x(x + 12)2 C. x(x - 12)2 D. prime