The cost of printing cookbooks is $2.09 per book plus a one time setup fee of $349. All taxes are included. Which of the following functions models a (x) the average cost per book of printing x books

For this case we have the following variable:

x = number of books

We write a function of the form:

y = mx + b

Where,

m = 2.09 $ / book

b = 349 $

Substituting values:

a (x) = 2.09x + 349

Answer:

A function that models a (x) the average cost per book of printing x books is:

a (x) = 2.09x + 349