Identify the property illustrated by the statement. Assume all variables represent real numbers.2 + 7 = 7 + 2
A. Associative
B. Commutative
C. Identity
D. Inverse
Answer: B
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Determine the coordinates of the focus and the equation of the directrix of the parabola.x2 + 8y = 0
A. F(0, -2), x = 2 B. F(0, -2), y = 2 C. F(0, -2), y = -2 D. F(-2, 0), y = 2
Use the summation properties to evaluate the series. The following rules may be needed: 
.
A. 685 B. 1125 C. 465 D. 915
Determine whether the ordered triple is a solution to the given linear system.(2, 9, -4)
A. Yes B. No
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