Find the solution to the system of equations by the substitution method. 5x + y = 0-5x + y = -10
A. (-1, 5)
B. (1, 10)
C. (-1, -5)
D. (1, -5)
Answer: D
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Find the indicated probability. Round as indicated.Find the probability of at least 2 girls in 7 births. Assume that male and female births are equally likely and that the births are independent events. Estimate the probability to three decimal places if necessary.
A. 0.773 B. 0.938 C. 0.063 D. 0.164
Rewrite the expression as a sum or difference of logarithms or multiples of logarithms.log4 
A. log4(7) - log4(13) B. log4(13) - log4(7) C. log4(13) + log4(7) D. log2(13) - log2(7)
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
Write the equation of the ellipse that has its center at the origin with focus at 
and vertex at 
.
?
A. 
B. 
C. 
D. 
E. none of these