Answer:
When you add 's to a noun it means that the thing you mentioned before belongs to that person.
In this exercise they want you to mention the stuff belonging to these nouns.
For example :
Martha' s purse.
Joann's book
I would change it beacause it was just such a horrible ending ugh
They are slow really slow
6.231 would round to 6.23, which is less than 6.24.