Use a half-angle formula to find the exact value of the expression.tan 165°
A. -
+ 2
B. -
- 2
C. 
- 2
D. 
+ 2
Answer: C
Mathematics
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A. 21.8 B. 6.9 C. 65.3 D. 5.4
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Express the number in scientific notation.270,000
A. 2.7 x 106 B. 2.7 x 105 C. 2.7 x 10-6 D. 2.7 x 10-5
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Simplify the algebraic expression.5x + 9y + 10 + 8x - 4y + 13
A. 18xy + 23 B. 13x + 13y + 23 C. 13x + 5y + 23 D. -3x + 13y + 23
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Solve for the variable.-12 + x = -2
A. -14 B. 14 C. 10 D. -10
Mathematics