One prepaid cell phone company charges $0.027 per minute and a $2 monthly fee. Another company charges $0.032 per minute with no monthly fee. For what number of minutes per month are the charges
for the first company cheaper?

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Step-by-step explanation:

z = 10

Step-by-step explanation:

50 + 30z = 250 + 10z

Step 1)

subtract 10z from both sides. You can do this because if you subtract 10z from the right side, you have to do the same thing on the same side. Any changes you make to the expression have to be done on both sides.

Now you have:

50 + 30z - 10z = 250

Step 2)

Simplify.

Since 30z and 10z have the same variables, you can subtract them to get 20z.

Now you have:

50 + 20z = 250

Step 3)

Subtract 50 from both sides. (You can do this for the same reason why you could do it in step one.

Now you have:

20z = 250 - 50 (this can simplify down to 20z = 200)

Step 4)

Divide both sides by 20. Again, same reason as step 1 and 3.

z = 200/20

z = 10

That’s your answer. Hope this helped! Tell me if the answer is correct!