How many people are added to the world population each year answer?

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?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

What is the slope of the line (-7,2) (4,6)