What is the length of XY ? Please answer correctly

Nnnnneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

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

Tyler reads 2/5 of a book on monday, 1/3 of it on tuesday, 2/9 of it on wednesday, and 3/4 of the remainder on thursday. if he still has 14 pages left to read on friday, how many pages are there in the book?