14×25×4 use subtraction

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?

Is a positive integer raised to a negative power always positive

Find the average rate of change for the given function drom x=1 to x=2