Ineed on this on this onr too anyone mind ?

To complete your spring schedule, you must add calculus and physics. at 9: 30, there are three calculus sections and two physics sections; while at 11: 30, there are two calculus sections and three physics sections. how many ways can you complete your schedule if your only open periods are 9: 30 and 11: 30?

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.