Respuesta :

kanest
Set up the equation for both plans:

[tex]\text{First plan: } 24 + 0.15x[/tex]

24 is the monthly fee. 0.15 is the cost per minute of calls. x is the amount of minutes of calls.

[tex]\text{Second plan: } 0.19x[/tex]

There is no monthly fee. 0.19 is the cost per minute of calls, and x is the amount of minutes of calls.

Because the question asks for the amount of minutes where the plans will cost the same, the equations will equal each other:

[tex]24 + 0.15x = 0.19x[/tex]

Subtract 0.15x from both sides:

[tex]24 = 0.04x[/tex]

Divide both sides by 0.04 to get x by itself:

[tex]x = 600[/tex]

The cost of the two plans will be equal at 600 minutes of calls.

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