A mean (also known as average) is adding up all the numbers you have and then dividing it by how many numbers you had. Tara says the mean is 6. When you add these numbers up you have 30 and there are 5 numbers. When you divide 30 by 5 you get 6, therefore Tara is correct.
Well for one I think their immaturity didn't help the situation. Their love was a lot like puppy love in the sense that it was their first time dealing with a relationship and therefore didn't know how to handle issues that were thrown at them. At the same time, some of the other characters may disagree because "young love is the best love" in the sense that it is pure and innocent.
Adjectives are words that describe other words. They often give details about how something feels or looks. They can also give details about where something comes from (the origin of the thing) or how long something lasts or the length of something.
In the sentence "The American had long standing love for African birds", long and African are adjectives because they are describing other words, specifically the nouns in the sentence.
Long describes the length of the American's love. African describes the origin of the birds since they are from Africa. The other words in the sentence are not adjectives.