Round 0.63 to the nearest tenth, hundredth and thousandth

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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?

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.