Please help me with all 3, I will mark brainliest as long as u tell me how u got those answers

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?

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2