Question

Someone help me please I don’t understand this

Answer 1

Set up the equation for both plans:


`\text{First plan: } 24 + 0.15x`

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


`\text{Second plan: } 0.19x`

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:


`24 + 0.15x = 0.19x`

Subtract 0.15x from both sides:


`24 = 0.04x`

Divide both sides by 0.04 to get x by itself:


`x = 600`

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