Use the graph to answer the question.
What was the difference between the highest and lowest monthly sales in 2008?
A. $4000
B. $2000
C. $8000
D. $6000
Answer: C
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Divide.
A. 27 B. -27 C. 0 D. Undefined
Determine whether the study involves selection bias, participation bias, both selection bias and participation bias, or neither.You are interested in the percentage of people in your city who favor tax cuts. You interview every twentieth person as they leave the church in your neighborhood.
A. Participation bias and selection bias B. Selection bias C. No bias D. Participation bias
Solve the problem.The number of students infected with the flu on a college campus after t days is modeled by the function 
When will the number of infected students be 220?
A. About 8 days B. About 16 days C. About 14 days D. About 12 days
Find the steady-state vector for the transition matrix.
