Perform the indicated operation.
A. 1
B. -81
C. Undefined
D. 0
Answer: D
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Find the domain of the vector-valued function.r(t) = ln (t - 1)i + 
j
A. {t ? ?: 1 < t ? 4} B. {t ? ?: 1 < t < 4} C. {t ? ?: t ? 4} D. {t ? ?: t > 1}
Solve the problem.Use the graphs to find the value of (f + g)(3).
A. -1 B. 3 C. 1 D. 0
Solve the problem.y varies directly as z and y = 342 when z = 19. Find y when z = 16.
A. 256 B. 288 C. 324 D. 361
Solve the problem.Suppose an isolated island has a native population of 10,000 and a person from a visiting ship introduces a disease which has an infection rate of 0.00005. Assume that the rate of spread of the disease satisfies the following logistic equation: 
= k
y, where N is the size of the population and y is the number infected at time t.How many individuals are infected after 23 days?
A. 9190 B. 8980 C. 9230 D. 9080