Express the product as a sum containing only sines or cosines.cos (5?) cos (4?)
A. 
[cos (9?) - cos ?]
B. 
[ cos ? + cos (9?)]
C. 
[cos (9?) - sin ?]
D. cos2 (20?2)
Answer: B
Mathematics
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Write as a percent. Round the percent to the nearest tenth if necessary.
A. 3.7% B. 18.5% C. 1000% D. 37%
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Determine if the function is increasing or decreasing over the interval indicated.f(x) = 
+ 7; (0, ?)
A. Increasing B. Decreasing
Mathematics
Use synthetic division to determine whether x - c is a factor of the given polynomial.x3 - 11x2 + 31x - 21; x - 3
A. Yes B. No
Mathematics
Completely factor the expression.
?
?
A. 
B. 
C. 
D. 
E. 
Mathematics