Hello,
To solve this question, let's use the process of elimination. One should know that a commercial will never cost 0 dollars to produce, therefore option one is out of the answer.
Now, the problem tells us that the cost of airing a commercial on television is modeled by the function C (variable of cost) multiplied by n (number of times the commercial is aired.)
C(n)=110n+900
This equation tells us that the cost equals 110 dollars times the number of times the commercial is aired plus 900 dollars, the cost of production.
Thus, the answer to your question is option 3; the commercial costs $900 to produce and $110 each time it is aired.
Faith xoxo