How would i find all the solutions to the equation "7*sin^2x-14*sinx+2=-5"?

What is the product of the radical expression. (7-2square root) (8+2 square root)

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?

Can someone me out here number 4 plz