Question 127228
First, let T represent the tuition cost that you are going to pay and C represent the credit
hours that you schedule.
.
Then ask yourself how you would compute your tuition based on the number of credit hours that
you sign up for. If you take only a 1 credit hour course, how much would you pay in tuition?
The answer would be $65 would it not? How about if you sign up for only a 3 credit hour course?
You would then have to pay tuition of $195. How about if you are a full time student and
you carry 16 credit hours? How much would you expect to pay in tuition?
.
Maybe you can see from this that you are computing your tuition bill by multiplying 
the number of credit hours you plan to take by the $65 fee for each credit hour. In other
words you have a tuition bill of $65 times C where C is the total number of credit hours.
In equation form this is:
.
T = 65*C
.
Since T depends on the number of credit hours, we say that T is a function of C or just 
that T is equal to f(C). Therefore in functional notation we can write:
.
f(C) = 65*C
.
Or if you care to identify the left side of this equation as relating to tuition, you 
could more appropriately write it as:
.
T(C) = 65*C
.
which makes it a little clearer to remember as being "the tuition as a function of C,
the credit hours, is equal to 65 times the number of credit hours" with the answer to
be expressed in dollars.
.
Hope this helps you to understand the problem a little better.
.