Please anwser this for me!!

Concept: Functions

In order to be a function, the values must satisfy the qualities stated below.No element in the domain and range of x corresponds to more than one representative value: ie x=2 and y= 8 but it cannot be that x=4 also.No element in the range can represent multiple values Hence we see in the chart that each x represent to a unique y and vise versa.So we determined that this is a function

C. 40,320 just did the math right now

55. i don’t no. but zhongshan