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Question: A library charges $0.7 per day for an overdue book. How much is charged for a book, which is 16 days overdue?


A ) $11.9
B ) $12.6
C ) $11.2
D ) $10.5

Steps to derive

1 Let f(x) be the amount charged for a book, x days overdue.

2 The amount charged for the book x days overdue = 0.7x
 [Write the variable expression.]

 [Write the function rule.]
3 f(x) = 0.7x

 [Substitute 16 for x to find the amount for the book, 16 days overdue.]
4 f(16) = 0.7(16)

 [Multiply.]
5 = 11.2

6 So, the amount charged for the book, 16 days overdue is $11.2.



Hence the right answer is Option C

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