Final answer:
To find how much more ribbon the red hair bow uses than the purple hair bow, subtract the length of the purple hair bow from the length of the red hair bow. The red hair bow uses 196.6 inches more ribbon than the purple hair bow.
Step-by-step explanation:
To find how much more ribbon is used to make the red hair bow than the purple hair bow, we need to subtract the length of the purple hair bow from the length of the red hair bow.
Red hair bow length - Purple hair bow length = 215 in - 18.4 in = 196.6 in
Therefore, the red hair bow uses 196.6 inches more ribbon than the purple hair bow.