Solve the problem.The perimeter of an octagon with sides of equal length is 8 times the length of one side, s. If the perimeter is 104 meters, solving the equation 
will give the length of one side. Solve the equation.
A. s = 104 meters
B. s = 13 meters
C. s = 52 meters
D. s = 26 meters
Answer: B
Mathematics
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Find the indicated probability.A bag contains 5 red marbles, 4 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability that it is not blue?
A. 
B. 
C. 
D. 6
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Express the number in decimal notation.4.14 × 10-4
A. 0.0000414 B. -414,000 C. 0.000414 D. 0.00414
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Solve the problem.In a clinical study, 19 of the 380 subjects receiving a migraine medication developed side effects. What percentage developed side effects?
A. 15% B. 7% C. 5% D. 4%
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Express in terms of a base raised to a positive exponent. Then simplify, if possible.(-5)-4
A. 625
B. -625
C. - 
D. 
Mathematics