Answer: 4 books
Step-by-step explanation:
The question can be transcribed to the equation [tex]5.50x+13=35[/tex]. The 5.50 is the price of each book, while x is the number of books. We don't know what x is yet. We add 13 to show the shipping cost. All of this is set equal to 35, which is the total of Ana's purchase. We can start by subtracting 13 from both sides of the equation or, put simply, subtract 13 from 35. The equation will then look like [tex]5.50x=22[/tex]. From there, divide both sides from 5.50 or, put simply, divide 22 by 5.50. You will then be left with x equalling the answer.
