Answer: To introduce a predictable outcome to the plot
Explanation: I think so
Persuasive writing is what that is called. Persuasive writing is the act of trying to get people to do what you want them to do like an advert.
1: Has Played
2: (circle "will buy") We bought a new car yesterday morning.
3: B
4: The Sound of Music
5: Disbelief
Slogan is pretty much like your ad or logo. It's a type of technique you'd use to get people to believe your product actually does what you say it does. Your slogan is also how people make ads rhyme and make it seem so good.
I hope that this helps with whatever you needed to know about a slogan. :)