the cost for a certain music plan is 9.99 per year plus 0.25 per song you download. if you paid 113.74 one year , find the number of songs you downloaded
From the question, you can get an equation 9.99 + 0.25x = 113.74 subtract 9.99 from both sides and get 0.25x = 103.75 then divide both sides by 0.25 so x = 103.75/0.25 = 415