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| PAGE: 126 | SET: Exercises | PROBLEM: 38 |
The function is 
.
Here 
represents the monthly cost of international calls in dollars and 
represents number of minutes used.
(a)
Find the cost when number of minutes used 
.
Substitue 
in the function 
.
The monthly cost of international calls in dollars is is 
dollars.
(b)
Find the number of minutes when monthly bill of international calls is 
.
Substitute 
in the function .
The number of minutes is 
.
(c)
Find the maximum no.of minutes when the cost is 
.
Substitute 
in the function .
The maximun number of minutes used is 
minutes.
(d).
Find the implied domain of 
, if there are 
days in the month.
The function , where number of minutes used can never be negative.
The month has 
days then total no.of minutes are 
Hence the implied domain of is 
or 
.
(a) The monthly cost of international calls in dollars is is 
dollars.
(b) The number of minutes is .
(c) The maximun number of minutes used is 
minutes.
(d) Tthe implied domain of is or 
.
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