You are a student visiting colleges in the chicago area. you fly in and out of o’hare airport and plan to take the 'l' train (public transportation) to all your destinations. you can either purchase a $5 cta card and pay an additional fee per ride or get the 7-day pass for $28 and not have to pay an additional fee per ride. determine if it is cheaper to purchase the cta card and pay per ride or purchase the 7-day cta pass. here are the cta fares: base/regular fares full reduced student 'l' train fare $2.50 $1.25 $0.75 'l' train fare from o'hare $5.00 $1.10 $0.75 cta card for use in single rides $5.00 7-day pass $28.00 select the correct definition of the variable x. x = cost per ride x = cost of pass x = number of rides x = cost of card