Express the sum or difference as a product.cos 2x - cos 4x
A. -2 sin 3x sin x
B. -2 cos 3x sin x
C. 2 sin 3x sin x
D. cos (-2x)
Answer: C
Mathematics
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Find the length of the curve.The parabolic segment r = 
, 0 ? ? ? 
A. 
(
+ ln(
+ 1))
B. 
C. 
(
- ln(
- 1))
D. 
?
Mathematics
The figure shows the percentage of the U.S. population, f(x), made up of teachersas a function of time, x, where x is the number of years after 1900. Use the graph to solve the problem. 
In which year did the percentage of teachers in the U.S. reach a minimum?
A. 2000 B. 1900 C. 1970 D. 1990
Mathematics
Provide an appropriate response.Evaluate: 8 + 2(x - 6)4, for x = 4.
A. 4 B. 24 C. 20,008 D. 40
Mathematics
Solve the equation.
 figure 1.png)
Mathematics