Answer:
49. The pattern is every time you add, you add the next positive number number and every time you subtract, you add the next negative number.
Explanation:
13 + 11 = 24
24 - 7 = 17
17 + 12 = 29
29 - 8 = 21
21 + 13 = 34
34 - 9 = 25
25 + 14 = 39
39 - 10 = 29
29 + 15 = 44
44 - 11 = 33
33 + 16 = 49
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