Find the exact value using a double-angle identity.cos(120°)
A. - 
B. - 
C. - 
D. 
Answer: C
Mathematics
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Solve the problem.If f(x) = 
, find a such that f(a) = 3
A. 121 B. 11 C. 17 D. 67
Mathematics
Find the standard deviation. Round to the nearest tenth.17, 12, 20, 20, 20, 6, 9, 14, 13
A. 4.8 B. 5.5 C. 1.8 D. 5.1
Mathematics
Solve the problem.The position of an object moving in a straight line is given by s = t2 - 8t, where s is in feet and t is the time in seconds the object has been in motion. How long (to the nearest tenth of a second) will it take the object to move 14 feet?
A. 8.4 sec B. 9.5 sec C. 9.3 sec D. 15.0 sec
Mathematics
Write the partial fraction decomposition of the rational expression.
A. 
B. 
C. 
D. 
E. 
Mathematics