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Mathematics 17 Online
OpenStudy (anonymous):

You were charged $51.50 last month for data usage on your smartphone. Your data plan charges a monthly fee of $20 plus $2.50 for each extra gigabyte (GB) used. How many extra gigabytes did you use last month?

OpenStudy (anonymous):

first subtract 20 from 51.50

OpenStudy (anonymous):

|dw:1424225450100:dw|

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