I dont quiet understand this any help?
Really appreciate if could answer all

Billie Eilish, who's (who has) had several hit songs recently, is one of my favorite singers. Danielle, who's (who has) lived in Australia for the past two years, just moved back to the U.S.Jack doesn't know whose number that is.

number of whom. it belongs to someone obviously.

My cousin Mike, who's (who is) one of the funniest people I know, is coming to visit next week. I don't know whose receipt it is, but this lasagna is delicious!

The receipt is "of whom". It must be belonging to someone, and they don't know who that someone is.

My mom asked, "Whose dirty shoes are on the kitchen floor?"

dirty shoes "of whom". shoes belong to someone

Regina, who's (who has) finally recovered from her cold, invited Ariadne to sleep over on Friday.

Explanation:

who's stands for who has or who is."whose" is associated with someone or something, as in of whom/ which.who's speak of living things, like a person who is funny or who has a resort. whose associates itself with non-living things(MOSTLY! The sentence can also be He's the person whose opinion I respect the most.), or we can say it associates itself with the belongings or characteristics of a living being.

1. who’s
2. who’s
3. whose
4. who’s
5. whose
6. Whose
7. who’s