Agroup of 19 students want to see the show at the planetarium. ticket cost $11 for each student who is a member of the planetarium's frequent visitor program and $13 for each student who is not a member. the total cost of the student tickets is $209. let x represent the number of student in the group who are members of the frequent visitor program. write an expression in term of x for the number of student in the group who are not member