Find the coefficient of x in the expansion of (x+7). Using the triangle.

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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?

Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?