Answer:
$2.57
Explanation:
This is the correct answer because all you have to do to solve is divide the $23.13 bill by nine because of the nine friends. (23.13/9 = X)
Once you've done that you should get an even $2.57. Please let me know if you need in-depth help with how to solve this problem or anything else. Have a great day and don't stress it, you'll get it eventually ^-^