Linear and Quadratic Functions

44. Phone Charges The monthly cost C, in dollars, for calls from the United States to Japan on a certain phone plan is modeled by the function C(x) = 0.07x + 24.99, where x is the number of minutes used. (a) What is the cost if you talk on the phone for x = 50 minutes? (b) Suppose that your monthly bill is $31.85. How many minutes did you use the phone? (0) Suppose that you budget yourself $36 per month for the phone. What is the maximum number of minutes that you can talk? (d) What is the implied domain of C if there are 30 days in the month? (e) Interpret the slope. (f) Interpret the y-intercept