What is the answer to this question?

Which function is shown in the graph below?

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?

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.