The school library is buying new books that cost $9 each. Which equation represents the total cost (t) for any number of books (b)? * Ot=b-$9 O t = b + $9 O b = $9t O t = $9b
The total cost is t, and that is equal to 9 dollars for each book bought, so we multiply the amount of books by 9, so 9b, we add the dollar sign and t = $9b.
