Primary elections are usually held in the summer to: -determine which party will have the larger amount of campaign funding
-determine who will represent each political party in the major election
-to make available election polling sites
-ensure all voters have the opportunity to vote

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering