Please help! this the last question

Use the knowledge of x- and y- intercepts to choose the correct graph of the equation 3x+6y=6

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 average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .