Which two sentence correctly use a dash?
Most of the working population today is troubled- by lack of sleep.
You need to sleep 6-8 hours daily to maintain a healthy body.
The secret to improving your productivity is simple-get a good night's rest.
I found something unexpected in my trash can-a litter of raccoons

You need to sleep 6-8 hours daily to maintain a healthy body.

The secret to improving your productivity is simple-get a good night's rest.

Explanation:

When you are listing specific numbers, sometimes you put a dash in between them: "6-8 hours daily" means "6 to 8 hours daily." In the next right answer sentence, sometimes you use a dash(hyphen) in between words to show that the words after the hyphen go accordingly to the words before. The first part of the sentence says "the secret to improving your productivity is simple-" Then, the second part of the sentence shows what the secret to improving your productivity is: "get a good night's rest."

when alex falls for the charming new boy at school, cole -- a handsome, funny, sports star who adores her - she can't believe she's finally found her soul who truly loves and understands her.  

at first, alex is blissfully happy. sure, cole seems a little jealous of her relationship with her close friend zack, but what guy would want his girlfriend spending all her time with another boy? as the months pass, though, alex can no longer ignore cole's small put-downs, pinches, or increasingly violent threats.  

as alex struggles to come to terms with the sweet boyfriend she fell in love with and the boyfriend whose "love" she no longer recognizes, she is forced to choose -- between her "true love" and herself.

explanation:

the knight would die while giong on a quest.