Find the exact value under the given conditions.cos ? = - 
, 
< ? < ?; sin ? = - 
, ? < ? < 
Find cos (? + ?).
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Use the figure to find the following.
? 
A. 
B. 
C. 
D. 
Mathematics
Solve the system by the substitution method.y = 3x2 + 6x
A. (2, 0), (3, 45) B. (1, 9), (-6, 72) C. (-2, 0), (-3, 9) D. (2, 0), (-3, 9)
Mathematics
Solve the problem.Suppose that for a particular brand of computer, the average lifespan is 90 months with a standard deviation of 9 months. If a computer lasts for 95 months, what is the z-score for the lifespan of the computer?
A. 0.71 B. 0.56 C. 0.61 D. 0.81
Mathematics
Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
A. 
B. 
C. 
D. 1
Mathematics