I really need help.
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Multiplying an even number of negative numbers gives an answer that is choose from:

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?