Respuesta :

C=.35x + 9.50

.35 is the amount per check so you put the x next to it because that represents how may check you use plus 9.50 per month
hope this helps
f(c)=$9.50+$.35c

You start with your base fee and then add the $.35 per check which is $.35 times the amount of the check which is unknown.

Hope this helps.
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