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1) 10 (2) 7 (3) $631 (4) a number decreased by 4 (5) 17n (6)30 (7) 3n = 42; about 14 books (8)845 (9) -36 (10) 5 (11) p-77=186;263 posters (12) -4 (13) 8 (14) 4 hours (15) 11 (16) x> line under it -2 (17) n > line under it 6 (18) x < line under it -21 (19)