Phone Charges The monthly cost C, in dollars, for callsfrom the United States to Japan on a certain phone plan ismodeled by the function C1x2 = 0.24x + 5, where x is thenumber of minutes used.(a) What is the cost if you talk on the phone for x = 50minutes?(b) Suppose that your monthly bill is $20.36. How manyminutes did you use the phone?(c) Suppose that you budget yourself $40 per month for thephone. What is the maximum number of minutes thatyou can talk?(d) What is the implied domain of C if there are 30 days inthe month?(e) Interpret the slope.(f) Interpret the y-intercept.
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
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Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
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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 C1x2 = 0.24x + 5, 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 $20.36. How many
minutes did you use the phone?
(c) Suppose that you budget yourself $40 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.
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