Explain help me please

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?

What properties allow transformation to be used as a problem solving tool

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1