2. Answer: 1.3 meters
1.8 - 0.5 = 1.3 meters
3. Answer: 9
3 - (-6) = 3 + 6 = 9
4. Answer: 31/12 or 2 7/12
-5/12 - (-9/3) = -5/12 + 9/3 = -5/12 + 3 = 31/12 = 2 7/12
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