Several students and adult chaperones are going on a field trip to the theater. each student ticket cost $2 and each adult ticket cost $4. the total cost for the trip is $144. there are 4 times as many students as adults going on the trip. if the expression, 2(4x)+4x, represents the total cost, what does x represent? a. the number of adults b. the number of students c. the cost of an adult ticket d. the cost of a student ticket