Solve the problem.The logistic function 
represents the population of a species introduced into a new territory after t years. When will the population be 50?
A. -2.72 yr
B. 11.23 yr
C. 10.52 yr
D. -2.01 yr
Answer: B
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Write one or more inequalities that describe the set of points.The closed region bounded by the spheres of radius 2 and 6, both centered at the origin, and the planes 
and 
A. 4 ? x2 + y2 + z2 ? 36 and 1 ? x ? 3 B. 2 < x2 + y2 + z2 < 6 and x = 1 and x = 3 C. 2 ? x2 + y2 + z2 ? 6 and x = 1 and x = 3 D. 4 < x2 + y2 + z2 < 36 and 1 < x < 3
Perform the indicated operation. Assume that all variables represent nonnegative real numbers.11
- 5x
A. 6x
B. 16
C. 11
- 5x
D. 6x
Match the vector equation with the correct graph.
r(t) = 2 cos ti + sin tk; 0 ? t ? ?
A. Figure 7 B. Figure 2 C. Figure 4 D. Figure 6
Write the indicated term of the binomial expansion.(x + 2y)11; 9th term
A. 42,240x8y3 B. 21,120x3y9 C. 21,120x8y3 D. 42,240x3y8