The sum of two numbers is 53 and the difference is 7. what are the numbers

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?

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Which of the following expressions is equal to 2x^2+8