Need help I DONT understand it

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?

Solve the system of equations y= 3/2 - 1, -x+ y =-3

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?