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What is the missing number in the arithmetic sequence -11, 5, __, 37, ...?

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Mlcparra16id
In an arithmetic sequence there is a common difference so:
37 - __ = __ - 5 = 5 - (-11) 
37 - __ = __ - 5 = 16

__ - 5 = 16
__ = 21
Kawaiiririid
answer is 21................