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Answer:
Third Option:
“I just had my car keys, but now I can’t find them anywhere. Has anyone seen my keys?”
Explanation:
First, the comma separates the now from the keys statement. This allows the sentence to flow more smoothly.
Second, the ”Has anyone seen my keys?” Is a question — in which it needs to be sepearated from a statement; “...but now I can’t find them anywhere.”
7/4 - 5/4
= 2/4
= 1/2
and
21/24 - 9/24
= 12/24
= 1/2
Hope this helps!!