Solve the problem.A bag contains 8 red marbles, 3 blue marbles, and 1 green marble. What is the probability of choosing a marble that is red or green when one marble is drawn from the bag?
A. 
B. 
C. 
D. 9
Answer: C
Mathematics
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Convert to a percent.
A. 40% B. 210% C. 205% D. 200%
Mathematics
Perform the operations.
A. 4,199.8 B. 444.98 C. 4,249.8 D. 424.98
Mathematics
Solve the problem.A formula for the focal length of a lens isf = 
Calculate f (the focal length) for a = 13 cm and b = 11 cm. Round your answer to the nearest tenth, if necessary.
A. 6.5 cm B. 5.5 cm C. 6.0 cm D. 7.0 cm
Mathematics
Use the given values to evaluate (if possible) three trigonometric functions sin x, cos x, cot x.
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?
A. ?
?
B. ?
?
C. ?
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D. ?
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E. ?
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Mathematics