Plz help b

Which system of linear inequalites is represented by the graph?

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?

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.