Solve the problem.Suppose a plumber charges $160 for the first hour plus $70 for each additional hour. Write an expression for the cost (in dollars) of a job lasting n hours.
A. 230n
B. 160 + 70n
C. 160 ? 70n-1
D. 160 + 70(n - 1)
Answer: D
Mathematics
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?
?
A. 
B. 
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D. 
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