Solve the problem.The total cost, in dollars, to produce x DVD players is 
Find the marginal cost when 
A. $2000
B. $754
C. $2120
D. $874
Answer: B
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Determine whether A = B, A ? B, B ? A, A ? B, B ? A, or if none of these applies.A = {x | x ? N and x > 9}B = {x | x ? N and 2 < x ? 9}
A. A ? B B. None of these C. B ? A D. A ? B and A ? B
Which of the following expressions is (are) linear equations?
a. 3x + 5 b. x + 18 = 30 c. 2x - 4 = 16 d. both b and c e. all of the above
Classify the surface. Select the correct answer.
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Evaluate the function for the indicated input and interpret the result.The table lists the number of persons voting in an election by election year and sex, for a small community. 
Let this table be a partial numerical representation of a function f, where 
computes the number of persons who voted in the year x whose sex is y. Evaluate 
Interpret the result.
A. f (1968, Female) = 888 The number of females who voted in 888 was 1968. B. f (1968, Female) = 699 The number of females who voted in 1968 was 699. C. f (1968, Female) = 15 The number of females who voted in 1968 was 15. D. f (1968, Female) = 657 The number of females who voted in 1968 was 657.