7. From the graph below, find what is f(15) and for what numbersat is fx} = I]. 8. Determine whether the graph is that of a function. If it is, use the graph to find its domain and range, the intercepts, if any, and any symmetry with respect to the xaxis, the yaxis, or the origin. 9. Determine whether the function is even, odd, or neither. a-f(r1:) = 43:3 "l b'flT) = Jim2:13 afx) = 3.153 5 1D. A cellular phone plan had the following schedule of charges: Basic service, including 100 minutes of calls is $20.00fmonth; 2nd 100 minutes of calls is $0.075/minute; additional minutes of calls is $0.10fminute. a. What is the charge for 200 minutes of calls in one month? b. What is the charge for 250 minutes of calls in one month? c. Construct a function that relates the monthly charge C for x minutes of calls