Use the method of natural frequencies to find the indicated probability.3.1% of a population are infected with a certain disease. There is a test for the disease, however the test is not completely accurate. 94.7% of those who have the disease test positive. However 3.9% of those who do not have the disease also test positive (false positives). A person is randomly selected and tested for the disease. What is the probability that the person has the disease given that the test result is positive?
A. 0.563
B. 0.777
C. 0.031
D. 0.437
Answer: D
Mathematics
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Find the area of the region specified in polar coordinates.the region enclosed by the curve r = 9 - 6 cos ?
A. 
?
B. 
?
C. 117?
D. 99?
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A booklet is rectangular and its length is 2 centimeters less than 2 times its width. Its area is 40 square centimeters. Find the dimensions of the booklet.
A. 5 cm by 8 cm B. 4 cm by 14 cm C. 4 cm by 8 cm D. 5 cm by 14 cm
Mathematics
Factor completely. If a polynomial is prime, then state this as your answer.(x + y)2 - 6(x + y) + 9
A. (x + y - 3)2 B. (x - 6)(y + 6) C. (x + y + 3)2 D. (x + y - 3)(x - y + 3)
Mathematics
Use the Pythagorean theorem to find the length of the unknown side of the right triangle. Give an exact answer.
A. 10
B. 15
C. 25
D. 5
Mathematics