Express the sum or difference as a product.cos 4x + cos 2x
A. 2 sin 3x sin x
B. 2 cos 3x sin x
C. 2 cos 3x
D. 2 cos 3x cos x
Answer: D
Mathematics
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Sketch the surface z = f(x,y).f(x, y) = 4x2 + 4y2 + 2
A. 
B. 
C. 
D. 
Mathematics
Factor the polynomial completely. If the polynomial is prime, so state.10z2 + 11z - 6
A. (2z - 3)(5z + 2) B. (10z + 3)(z - 2) C. (2z + 3)(5z - 2) D. prime
Mathematics
Determine the number of turning points of the graph of the function 
a. Number of turning points: 3 b. Number of turning points: 1 c. Number of turning points: 2 d. Number of turning points: 4
Mathematics
Evaluate the equation.
Mathematics