What is the least common multiple of 4 and 10? 2 4 20 40

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?

What is the value of x in the diagram below?

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i