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Alina [70]
3 years ago
12

_

Mathematics
1 answer:
QveST [7]3 years ago
6 0

Answer:

Step-by-step explanation:

Let x represent the number of calls made with plan 1 in a month.

Let y represent the number of calls made with plan 2 in a month.

Plan 1 charges $25 per month for unlimited calls. This means that the total cost of x calls made with plan 1 in a month would be $25

Plan 2 charges $15 per month plus $0.04 per call. This means that the total cost of x calls made with plan 1 in a month would be

15 + 0.04x

a) for the number of calls for which Plan 1 is more economical than Plan B, it becomes

25 < 15 + 0.04x

25 - 15 < 0.04x

10 < 0.04x

0.04x > 10

x > 10/0.04

x > 250

b) plan 1 would be more economical when the calls per month exceed 250.

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