Complete the identity.sin x (sin 2x + sin 4x) = ?
A. 
cos x (cos 2x - cos 4x)
B. cos x (cos 2x + cos 4x)
C. 
cos x (cos 2x + cos 4x)
D. cos x (cos 2x - cos 4x)
Answer: D
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Calculate the surface area of the given surface.The part of the plane with equation 3x + 4y + z = 16 and lying in the first octant.
A. 
B. 
C. 13
D. 
Solve.Suppose that you are planning a trip to England so you need to obtain some British pounds. The amount received in pounds varies directly with the amount in U.S. dollars. Your friend just converted $1900 into 1045 pounds. If you wish to convert $2500 into pounds, how many pounds would you receive?
A. 4545 pounds B. 1325 pounds C. 1645 pounds D. 1375 pounds
Solve the problem.Evaluate tan 
.
A. 0
B. 
C. 2
D. Undefined
Graph the solution of the system.3x - 2y ? 6 x - 1 ? 0
A. 
B. 
C. 
D. 