Question 1176147
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It is impossible to know what the missing number is; ANY number there would make a valid sequence.<br>
In any problem like this where the sequence of numbers is shown without any information about what kind of sequence it is, all you can do is look for a pattern that predicts what the missing number MIGHT be.<br>
In this problem, there is a nice pattern that can be used to find a PROBABLE answer to the problem.<br><pre>
    -8    ___    6    10    12  <-- the given numbers
       ___   ___   +4    +2     <-- the differences between successive numbers<br></pre>
Use the pattern of the differences to work backward in the sequence....<br>