Respuesta :
You must use capital letters in the following instances, particularly in formal writing: 1) In the names of people, places, days and months (not seasons), languages, religions, and so on (also known as "proper nouns"); 2) At the beginning of a sentence; 3) In titles of books, films, organizations, and special days and holidays; 4) In abbreviations or acronyms; 5) In titles that come before names; 6) And in compass points when they indicate regions, among other instances.
Therefore, the following words in your examples should be capitalized:
11. In the West, the weather is more moderate year round than it is in the Midwest, but Northern California is cooler and more humid than Southern California.
12. Alan Anderson, Treasurer of the Roosevelt School PTA, endorsed the purchase of a computer for the school library, but PTA President Sue Jenkins has reservations about making such a purchase now.
13. Our family has its spring reunion on Memorial Day Weekend each year.
14. We missed the Sixteenth Ward political rally held by Alderman Paul T. Johnson.
15. In Northern Michigan, the autumn leaves are spectacular in mid-October.
11. In the West, the weather is more moderate year round than it is in the Midwest, but Northern California is cooler and more humid than Southern California. ( Capital letters are used at the beginning of a sentence. Cardinal points when used as adjectives and refer to a region. When they indicate direction, they are not capitalised. For example, " The wind is blowing from the west).
12.Alan Anderson, treasurer of the Roosevelt School PTA, endorsed the purchase of a computer for the school library, but PTA President sue Jenkins has reservations about making such a purchase now. ( Proper names , names of institutions and posts from institutions :PTA President).
13. Our family has its spring reunion on Memorial Day weekend each year.( Beginning of the sentence; holiday :Memorial Day functioning as premodifier of weekend).
14. We missed the Sixteenth Ward political rally held by Alderman Paul T. Johnson. ( At the beginning of the sentence; important political events and proper nouns).
15. In Northern Michigan, the autumn leaves are spectacular in mid-October. ( At the beginning of a sentence ; regions and months).