Multiply, then simplify the product. If variables are present, assume they are positive.(
+ y)(
- y)
A. x + 2y
B. 12x
C. 11x - y2
D. x - 2y
Answer: C
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Set up the iterated integral for evaluating 
over the given region D. DD is the right circular cylinder whose base is the circle 
in the xy-plane and whose top lies in the plane 
.
A. 
B. 
C. 
D. 
Solve the given problem by using Laplace transforms.A pendulum moves with simple harmonic motion according to the differential equation 
where ? is the angular displacement and D = d/dt. Find ? as a function of t given that 
and ? = 0 when 
A. ? = -0.14 sin 4.2t B. ? = 0.14 sin 4.2t C. ? = 1.3 sin 8.5t D. ? = 0.14 cos 4.2t
Find the limit of the sequence if it converges; otherwise indicate divergence.an = 1 + (-1)n + (-1)n(n+1)
A. 0 B. 3 C. 1 D. Diverges
State whether the line between the two points is increasing, decreasing, horizontal, or vertical.(-15, 4) and (-3, 8)
A. increasing B. decreasing C. horizontal D. vertical