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maryjane8872
08.10.2019 •
Mathematics
Abasic cellular package costs $20 per month for 60 minutes of calling, with an additional charge of $0.20/min beyond that time. the cost formula would be c = 20 + 0.20(x − 60), where c is the cost measured in dollars and x is the number of calling minutes used. if you cannot have a bill greater than $60, what is the maximum number of calling minutes you can use?
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Ответ:
you can use 260 min, 60 min at a fixed price ($20) and extra 200.
Step-by-step explanation:
C(x) = 20 + 0.20(x − 60)
C(x) ≤ 60
20 + 0.20(x − 60) ≤ 60
0.20(x − 60) ≤ 60 - 20
0.20x - 12 ≤ 40
0.20x ≤ 40 + 12
0.20x ≤ 52
x ≤ 52/0.2
x ≤ 260
This way, you can use 260 min, 60 min at a fixed price ($20) and extra 200.
Ответ: