This is what it looks like. It opens to the right.
9. 31 + 5 = 36
10. 16 - 4 = 12
12. 9
13. 44 + 34 = 78
14. 101 - 1 = 100
15. -539 ???
16. 15 ??
17. |-435| = 435
In order to answer this, we need an image to be able to see what they look like.
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