Number is 11.
1 (+1) 2 (+2) 4 (+3) 7 (+4) 11 (+5) 16 ...
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16. 1 is added to the difference each time: 1 + 1 = 2 2 + 2 = 4 4 + 3 = 7 7 + 4 = 11 11 + 5 = 16 [the missing number] 16 + 6 = 22
c) 17
36
-8
Oh honey, that's just a simple pattern of squares. The missing number is 16 because 1 squared is 1, 2 squared is 4, 3 squared is 9, and 4 squared is 16. It's basic math, darling.