Mr. Russo and Mrs. Adams are planning a trip for 20 students to go to Kings Island. The cost of admission is $20 and the cost to ride the bus is $4 for each student. Write an expression that can be used to find the total amount for all 20 students to go on the trip. Then solve the expression.

Step-by-step explanation:

1. Set up the expression

          Let C = the total cost of admission

          Let n = the number of students

     Then 4n = the cost for those students, and

              20 = admission cost

and 4n + 20 = total cost of admission. Then the expression is

                C = 4n + 20

2. Solve the expression

If n = 20,  

C = 4(20) + 20 = 80 + 20 = $100