the roaming sell phone company charge's 15.00 a month plus 0.20 per minute of airtime usage. if juanita uses x minutes of air time what is the equation that can be used to determine her monthly phone bill (c)?

$63.00

Step-by-step explanation:

Since you have sales tax, you would do a 10% sales tax for 15 dollar

10/100 = x/15

Therefore you will calculate x and 100 divided by 15 which would be 6.6 repeated

You would round to the nearest tenth and get 6.6 then you would add 56.4 as in the tip+ month airtime usage and get 63 dollars.