Help me please! i need help :(

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?

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Which strategy is used by public health to reduce the incidence of food poisoning?