Type the correct answer in the box.
The number of guests per month at a large resort is given in the table below, where f(x) is the number of guests, in hundreds, x months since the
beginning of the year.
X=0,2,4,6,8,10 f(x)=10,15,18,19,18,15
Use the data in the table to create the standard form of the function that models this situation, where a, b, and c are constants.