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) = 0.07 + 24.99

Where x is the number of minutes used and C is in dollars

a) What is the cost if you talk on the phone for 45 minutes?

b) Suppose that your monthly bill is $40, how many minutes did you use on the phone?

c) Suppose that your monthly budget only allows $50 on the phone. What is the

maximum number of minutes that you can talk?

d) Suppose D(x) models another phone plan that charges

D(x) = 0.14 + 10.99

Where x is the number of minutes used and C is in dollars

If you typically can only spend $50 a month for the phone, which plan C(x) or D(x)

would provide more minutes per month?