Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.tan 570°
A. 
B. -
C. 
D. 
Answer: D
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Solve using Cramer's rule.2x + 3y = 232x - 3y = 5
A. (7, 3) B. (-3, 7) C. (-7, -3) D. (3, 7)
Factor the four-term polynomial by grouping.xy + y + 5x + 5
A. (5x + 5)(y + 1) B. (x + 1)(y + 5) C. (x + 5)(y + 1) D. (x + 1)(5y + 5)
Use DeMoivre's Theorem to find the indicated power. Write the answer in rectangular form.(- 
+ i)6
A. 64i
B. 64 - 64
i
C. -64
D. -64
+ 64i
Use the accompanying graph of a particle moving on a coordinate line with velocity v = f(t) in ft/sec at time t seconds. The axes are marked off at one-unit intervals. Use these terms to describe the motion state: moving forward/backward, increasing/decreasing speed, and resting. Recall that speed = 
. 
Give the interval(s) when the particle is moving backward.
A. (8, 11) and (19, 21) B. (8, 21) C. (11, 19) D. (0, 8) and (21, 25)