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"bernadette's cell phone plan costs a basic charge of $20 a month plus 5¢ per minute of calling time after she uses the first 300 minutes of calling time in a month.
a.write a linear equation for the total cost, c dollars, in terms of the total number of minutes of calling time, t minutes."

Respuesta :

W0lf93
20+ .05(t-300) = c  
The equation includes the basic charge or $20 that is not dependent upon anything. Then the equation has you determine how many minutes will be charged by subtracting the 300 provided minutes from t. t represents the total number of minutes. Once the subtraction is completed, you will multiply the number of minutes by the 5 cents (,05), adding in the 20 for total cost for the month.