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Question: Zelma had $20 in her pocket. The money left with her after buying books is equal to $20 minus $3.40 times the number of books she bought. Choose the function that represents a relation between the number of books she bought and the money left with her.


A ) f(n) = 20 - 3.40n
B ) f(n) = 23 - 3.40n
C ) f(n) = 20 + 3.40n
D ) f(n) = 20 - n

The right answer is Option A

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