The monthly cost C, in dollars, for calls from the United States to Germany on a certain
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The monthly cost C, in dollars, for calls from the United States to Germany on a certain wireless plan is modeled by the function C(x) = 0.26x + 5, where x is the number of minutes used.
(a) What is the cost if you talk on the phone for 50 minutes?
(b) Suppose that your monthly bill is $21.64. How many minutes did you use the phone?
(c) Suppose that you budget $50 per month for calls to Germany. What is the maximum number of minutes that you can talk?
(d) What is the domain of C if there are 30 days in the month?
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