Find the phase shift of the function.y = -3 cos (6x + ?)
A. 3? units to the right
B. 6? units to the right
C. 
units to the left
D. 
units to the left
Answer: C
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Solve the problem.The function A described by A(r) = 4?r2 gives the surface area of a sphere with radius r. Find the area when the radius is 4 in. Round your answer to two decimal places.
A. 50.27 in.2 B. 201.06 in.2 C. 64 in.2 D. 150.8 in.2
Find all the first order partial derivatives for the following function.f(x, y) = 7x - 4y2 - 2
A. 
= 5; 
= -8y - 2
B. 
= -8y; 
= 7
C. 
= 7; 
= -8y
D. 
= 7x; 
= -8y
Sketch the graph and show all local extrema and inflection points.y = 
A. Local minimum: (2,-1)
Local maximum: (-2,1)
Inflection point: (0,0)
B. Local minimum: (-2,-1)
Local maximum: (2,1)
Inflection point: (0,0), (-2
, -1
),(2
, 1
)
C. Maximum: (0,1)
No inflection point
D. Local minimum: (-2,- 
)
Local maximum: (2,
)
Inflection point: (0,0)
Perform the addition visually using symbols.-5 + (-1)
A. -6 B. 6 C. 4 D. -4