Free points ! but who’s y’all’s favorite artists ?

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?

Issof claims that the scale factor is 1/2. which statement about his claim is correct

The area of a circle is equal to 1 dm². find the radius of the circle.