PLEASE HELP ITS 58 POINTS:(!
Tasty Tacos offers delicious steak, chicken, or fish tacos served in your choice of a flour or corn tortilla. The mapping diagram below shows the number of tacos that previous guests have ordered and the total cost of their order

Number of tacos ordered. Total Cost

3 4.25
4 5.60
5 10
6 12.25

Does this represent a function why or why not?
State the domain and range.