Which of the following is a linear function?

y = x3 + 1
five over sixx = y − 4
y = 8x2
y = one over five x

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Aweekly newspaper charges $72 for each inch in length and one column width. what is the cost of an ad that runs 2 column inches long and 2 columns wide? its not 288

Aparking garage charges $1.12 for the first hour and 0.50 for each additional hour. what is the maximum length of time tom can park in the garage if we wishes to play no more than $5.62