The root of the word "vocabulary" for example is a Latin root meaning word or name.
What are Roots of Words?
Root words are also useful for creating new words, especially in technology and medicine, where new innovations occur frequently
Because several modern languages share some of the same ancestor languages, it's not entirely uncommon for several related languages to share root words.
For instance, the Latin root, described above, is shared by several Romance languages.
Understanding the meanings of the common word roots can help us deduce the meanings of new words that we encounter
5 times but it’s concerning you don’t know how to do this. I’m not trying to judge but I’ll try to explain. First trip 9-2=7. Second Trip 7-2=5. Third trip 5-2= 3. Fourth trip 3-2. Fifth trip 1-1= 0.
You didnt provide the second sentence but from my understanding the prefix "un" , which means not, could be added to friendly to mean unfriendly or not friendly.