Answer:
it's answer choice 2
Step-by-step explanation:
because when it says , including$4.90 , you're adding
when it says each book , each is your x of course and $6.50 is going to be next to x so $6.50x because EACH book is $6.50
and the amount of books, you don't know , so that's why it's x, the amount of books
