Are the common multiples of two numbers always the multiples of there least common multiples?

An alien has just landed from the planet, iksnimak. he would like to leam how to add two fractions when thedenominators are the same. write a paragraph that explains to our alien friend, in your own words, the detailsabout how to add the fractions, how to change the result to a mixed number, and how to reduce the fractionpart. use this problem as your example: the two fractions are 5/8 & 7/8

Given right triangle xyz, which correctly describes the locations of the sides in relation to

Asap! i'm not good math and i'm lost.