Questions 11–15: choose the letters that should be capitalized in words in the following sentences.

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.

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.

the answer is

r ≈5.641

plug in the area of 100 yards into the equation

100=

divide each side by pi

≈ 31.8309=

take the square root of each side to find r

=r

r ≈5.641

at hatfield elementary school, there are 504 students in 7 classes. each class has the same number of students. what is a good estimate of the number of students in each class?