18) cos 8º - cos 224°

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?

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

How do i do this activity, is appreciated