I'm trying to determine how to express cost as a function of X for a math problem my son is working on.?

The problem is as follows: the cost of a phone call is based on paying $9.50 for the first three minutes and $2.00 per minute each additional minute or fraction thereof. How do you express this in an algebra equation (i.e., C(x) = ??????).

I'm trying to determine how to express cost as a function of X for a math problem my son is working on.?
A cost function should look like this:





Total cost = Rate per additional minutes x Number of additional minutes + Cost for first 3 minutes or:





C(x)=2(x-3)+9.50
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Reply:C(x)=7.50(3-x)


C(x)=9.50(x)+2(x-3)


C(x)=4.75(x-1)


C(x)=9.50(y)+2(x-3)


C(x)=9.50x+2(x-3)


C(x)=9.5(3-x)+2(x-3)


C(x)=9.5y+2(x-y)





Actually, i think it is:


C(x)=9.50+2(x-3)


but I can't figure out how to twist it to work for a 1 or 2 minute call.