Answer:
10. 23
11. -17
12. 0
13. -4
14. -6
15. 4
Step-by-step explanation:
10. 8+15= 23
11. -8-9= -17
12. 8-8= 0
13. -8+4= -4 (same as 4-8)
14. -10+4= -6 (same as 4-10)
15. 12-8= 4
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