please answer all parts

12. After a few weeks, you now realize that your local feature branch ( backend_fix ) is woefully out of date with master. After running git checkout master, git pull origin master , and git checkout backend_fix, what command do you use to merge the changes from master into your current branch? (1 point) YOUR ANSWER GOES HERE 13. Assuming you are done with your backend_fix branch, what command do you give to delete it? (1 point) YOUR ANSWER GOES HERE 14. You want to perform a git pull, but you have some changes that you don't want to commit yet. What is a command you can use to hide your changes? YOUR ANSWER GOES HERE 15. Both git merge and git rebase are used to combine two different branches into one. Please describe the difference between git merge and git rebase. (1 point) YOUR ANSWER GOES HERE 16. GitHub isn't the only online git management system. Name another possible system to use (1 point) YOUR ANSWER GOES HERE 17. What is the purpose of "tagging" a commit? What command is used to create a tag named "final" on a commit? (2 points; one per question) YOUR ANSWER GOES HERE 18. What is a git "conflict", and how are they resolved? (1 point, half per section)