use interval notation to describe where f is increasing and where f is decreasing (please lable your answers as increasing or decreasing)

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Which inequality has a dashed boundary line when graphed ?