Final answer:
Melanie will need 15 containers to divide her 6 cupcakes and 9 cookies equally.
Step-by-step explanation:
To find the number of containers Melanie will need, add the total number of cupcakes and cookies she baked. She baked 6 cupcakes and 9 cookies, so she has a total of 6 + 9 = 15 baked goods. Since Melanie wants to divide them equally into containers, each container will have 1 baked good. Therefore, Melanie will need 15 containers.