Solve the equation for the interval [0, 2?).cos2x + 2 cos x + 1 = 0
A. x = 
, 
B. x = 
, 
C. x = ?
D. x = 2?
Answer: C
Mathematics
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A. $3.60 B. $15.00 C. $90.00 D. $21.60
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Perform the indicated operation.Express 94 × 81 as a power of 3.
A. 38 B. 39 C. 310 D. 312
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Solve the problem.A weather forecaster has predicted a high temperature of 20°C for tomorrow. Find this temperature in degrees Fahrenheit. If necessary, round to the nearest tenth of a degree.
A. 43.1°F B. 68°F C. 4°F D. -20.9°F
Mathematics
Add or subtract as indicated.
+ 
A. 
B. 
C. 
D. 
Mathematics