Write a formula for a linear function that models the situation. Choose both an appropriate name and an appropriate variable for the function. State what the input variable represents and the domain of the function. Assume that the domain is an interval of the real numbers.
Text Messages In the first month of 2010 about 0.4 trillion text messages were sent. The number of text messages being sent during 2010 grew by 0.5 trillion per month. (Source: CTIA.)
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