Solve the equation.
tan(?) + 1 = 0 for -360° ? ? ? 360°
A. {-150°, -30°, 30°, 150°}
B. {-330°, -150°, 30°, 210°}
C. {-30°, -210°, 150°, 330°}
D. {30°, 150°, 210°, 330°}
Answer: C
Mathematics
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Use the graph to answer the question.
Mike decides to buy shares of companies A, B, and C, which were initially selling for the same price. The changes in each stock's value are shown in the graph above. After how many days did stock C's value go below 
A. 60 B. 80 C. 40 D. 30
Mathematics
Decide whether the expression is or is not an identity.sin (A + 4?) = cos (A + ?)
A. Not an identity B. Identity
Mathematics
Simplify.i17
A. i B. -i C. -1 D. 1
Mathematics
Solve. Give your answer as a mixed number if appropriate.
= 
A. 5 B. 4 C. 2 D. 20
Mathematics