Use the sum-to-product formulas to rewrite the sum or difference as a product.
?
cos 3? + cos 8?
?
A. ?
B. ?
C. ?
D. ?
E. 
Answer: E
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Solve the system of equations.-5x - y - 3z = -584x + 7z = 602y + z = 16
A. No solution B. (-8, 6, 16) C. (8, 4, 6) D. (8, 6, 4)
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: real numbers > 0; level curves: ellipses 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: ellipses 
C. Domain: all points in the xy-plane except (0, 0); range: all real numbers; level curves: ellipses 
D. Domain: all points in the xy-plane except (0, 0); range: real numbers > 0; level curves: ellipses 
Evaluate the expression for the given values.
(a) x = 3(b) x = - 3(c) x = 0
A. (a) - 4
(b) - 
(c) - 
B. (a) - 
(b) - 
(c) - 
C. (a) - 
(b) - 
(c) - 
D. (a) - 4
(b) - 
(c) - 
Provide an appropriate response.Is the best buy (lowest cost per unit) always the best value? Give an example when this is not true and explain why.
What will be an ideal response?