Solve the problem.A kitchen remodeling company determines that the marginal cost, in dollars per foot, of installing x feet of kitchen countertop is given by 
Find the cost of installing an extra 10 feet of countertop after 30 feet have already been ordered.
A. $21.43
B. $48.74
C. $42.86
D. $245.62
Answer: A
Mathematics
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(3).
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A. x = 
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