Question

How to start, there is also a second part to it but I'm pretty sure once I get the right formula I will be all set

Answer 1

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

Answer 2

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.