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marvinsductant6710
31.08.2019 •
Mathematics
Customers of a phone company can choose between two service plans for long distance calls. the first plan has no monthly fee but charges $0.18 for each minute of calls. the second plan has an $18 monthly fee and charges an additional $0.14 for each minute of calls. for how many minutes of calls will the costs of the two plans be equal?
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Ответ:
The solution would be like this for this specific problem:
Let x be equal to the number of minutes per month and y be equal to the total cost. Utilizing these variables, we can write an equation that can represent each calling plan.
Plan 1: y = (.18)x
Plan 2: y = (.14)x + 18
Now, we can solve for x (minutes of calls per month) by integrating the two equations. There are a lot of ways we can do this, but we can use the one below:
y = (.18)x = (.14)x + 18
(.18)x - (.14)x = 18
(.04)x = 18
x = 450 minutes
Therefore, the cost of the two plans will be equal when each of the plan use 450 minutes of call per month.
Ответ:
4
Step-by-step explanation: