Determine whether the sets are equal, equivalent, both, or neither.{4, 15} and {4, 1, 5}
A. Equivalent
B. Neither
C. Equal
D. Both
Answer: B
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Perform the indicated operation.
A. 5
B. - 
C. -15
D. -5
Solve the problem.In September 1998 the population of the country of West Goma, in millions was modeled by 
At the same time the population of East Goma, in millions was modeled by 
In both formulas x is the year, where 
corresponds to September 1998. Assuming these trends continue, estimate what the population will be when the populations are equal.
A. 1 million B. 17 million C. 18 million D. 19 million
Solve the problem.An airplane is sighted at the same time by two ground observers who are 5 miles apart and both directly west of the airplane. They report the angles of elevation as 13° and 
How high is the airplane?
A. 1.87 mi B. 1.12 mi C. 2.69 mi D. 4.49 mi
Use Bayes' rule to find the indicated probability.The incidence of a certain disease on the island of Tukow is 4%. A new test has been developed to diagnose the disease. Using this test, 91% of those who have the disease test positive while 4% of those who do not have the disease test positive (false positive). If a person tests positive, what is the probability that he or she actually has the disease?
A. 0.438 B. 0.487 C. 0.91 D. 0.856