To find 7×23 is it easier to break apart the factor 23 as 20 +3 or 15+8 explain

Plzzz answer both questions and i will give you 100 points

Mr. t has been dating his girlfriend for one year nine months and six days how many hours has mr. t been in a relationship

Suppose m: angle a =77 degrees what is the measure of a complement of a complement of angle a, what is a conclusion you can draw about a complement of a complement of an angle