Solve the equation by using sum-to-product identities in the interval [0, 2?).cos 4x + cos 2x = 0
A. 
B. 
C. 
D. 
Answer: D
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Solve the problem.In a survey, people are asked to rank 7 issues such as the economy and the environment in order of importance. Replies are filed in folders, and two replies are put in the same folder if and only if they give the same ranking to all 7 issues. Find the maximum number of folders that might be needed.
A. 5040 B. 49 C. 7 D. 40,320
Change the binary number to decimal form.1100.1
A. 13.5 B. 12.75 C. 20.25 D. 11.245 E. 12.5
Divide, if possible. If not possible, write "not defined."
A. 293 B. 293 R2 C. 293 R3 D. 292 R8
Solve the problem.A field microphone used at a soccer game has a parabolic cross section and is 20 inches wide at the opening. The focus is 25 inches from the vertex. Find the depth of the microphone.
A. 0.44 in. B. 4.00 in. C. 16.00 in. D. 1.00 in.