Tìm giơi hạn của hàm số y= 2cosx/3sin x

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?