A parking garage charges a​ one-time fee of ​$5.00 plus ​$1.50 per half hour. Choose the function which represents the total​ cost, C(x), for parking for x hours. Which is the correct cost​ function?

A parking garage charges a​ one-time fee of ​$5.00 plus ​$1.50 per half hour. Choose the function which represents the total​ cost, C(x), for parking for x hours.

Which is the correct cost​ function?