Answer:
9(s+3.00) + 4s
Explanation:
For starters, we s as the basic cost of the shoe. If we buy 4 of those, than it's a simple 4s.
For the other 9 shoes, we have an additional cost of $3. So we will add 3 to s. Since we are buying 9 or those, we will multiple s + 3 by 9. Thus creating the equation above.