Subtract these polynomials (x^2+5x+6) - (5x^2-x-2)

What is the equation of the linear function represented by the table?

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 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?