1) (- 9) + 6 a) 3 b) -3 c) 15 d) -15 2) 8 + (- 2) a) 6 b) -6 c) 10 d) -10 3) (- 4) + (- 12) a) -8 b) 8 c) 16 d) - 16 4) 9 - ( - 2 ) a) 11 b) 7 c) - 11 d) - 7 5) - 8 - ( - 4 ) a) 12 b) - 12 c) 4 d) - 4 6) - 15 - 8 a) 23 b) - 23 c) 7 d) - 7 7) It is a subset of a line with two endpoints a) ray b) line segment c) line d) point 8) 6 - 15 a) 21 b) - 21 c) 9 d) - 9 9) -18 - ( -6 ) a) -24 b) - 12 c) 12 d) 24 10) It is formed by two non collinear rays with common endpoint and common vertex a) ray b) angle c) plane d) line

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