Trimming split ends

Q: My friend wants to cut her hair which is below her buttocks and she is complaing that it is thin and has split ends, what should we tell her? Also if she intends to cut it upto the lower part of her back, is it permissble? She says that she is doing it for growth and because it gets stuck in her buttocks. However, because shes an alimah Im telling her to do ihtiyaat since we sometimes end up taking leeways and following desires. What should I tell this girl because she keeps insisting that she wants to do it?

Meaning of Salawaat upon Nabi (sallallahu alaihi wasallam)

Q: My Question is that why we say 'Peace Be Upon Him' for Holy Prophet? Is Holy Prophet not in peace and safe?

In the Holy Quran Allah says that when beleivers come to you say to them ''salam alaikum - may you be safe" so this verse is for living people not for those who have passed away and we are sure that Holy Prophet is safe and in peace. So why "Sallallahu Alaihi Wasallam"? As generaly given refrence is that Allah says in Holy Quran that I read and My angels read salat to Holy Prophet so you should also read but actually the sense and meaning of this verse is "I and My angles help Holy Prophet and you should also help him" Please explain.

Suburbs being joined to the city

Q: I have travelled the musaafir distance to a major city with many suburbs within it, and I will be residing in this city for two months. However, from time to time, I will move between the suburbs of this city and spend the night in the different suburbs of this city. Up to now, I do not have the intention to stay 15 days in one particular suburb. Am I a musaafir or a muqeem?

Were the previous ummats commanded to invite towards good and forbid from evil?

Q: Kindly clarify whether it is correct to say that in the previous ummats, only the Nabi was allowed to give dawat. As proof, it is said that Hazrat Haroon (Alayhis Salaam) was made a Nabi in order to accompany Nabi Musa (Alayhis Salaam). But is it not the case that the person mentioned in Surah Yaseen also gave dawat to people by asking them to follow the Nabi? Also, people in previous ummats had to act to prevent people from wrongdoing (preventing evil is also considered part of dawat). Does this not show that ummatis of the previous ummats also had to engage in some form of dawat?

Ordering Islamic books online

Q: Is it permissible to order Islamic books online and have them delivered through shipping, even though the books contain aayaat (and some are tafseers and translations) and one knows that the shipping process is quite rough? Realistically, the packages will be thrown around, placed on the ground, will have other goods placed upon it, might even get stepped on, etc. before it gets to the destination. Am I allowed to order?