You want to buy dome new books that cost $13 each. Shipping is $5 per order. If you but 9 books, what us the cost of the order

Respuesta :

13(9) + 5(9) = $162 if you buy the books separately
13(9)+5 = $122 if you buy all of the books in the same order.
$13 per book, 9 books. 13•9=117