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Find the missing number, $x$, in the following matrix $$\begin{matrix} 16 & 13 & 9\\ 11 & 8 & 6\\ 9 & 7 & x \end{matrix}$$

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closed as off-topic by Gareth McCaughan Jun 27 at 22:37

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This looks like a puzzle you found elsewhere. For content you did not create yourself, proper attribution is required. If you have permission to repost this, please edit to include (at minimum) where it came from, then vote to reopen. Posts which use someone else's content without attribution are generally deleted." – Gareth McCaughan
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ hi there, welcome to puzzling! however, unattributed puzzles may get closed. please provide the source as soon as possible. thanks! $\endgroup$ – Omega Krypton Jun 7 at 11:13
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    $\begingroup$ (Why are we assuming this is not OP's self-created content? We should assume content is original unless there's pretty good indications it isn't — such as actually finding it elsewhere, in which case posting a link to the other source would be appropriate. I don't see any of that here; did I miss something?) $\endgroup$ – Rubio Jun 10 at 2:24
  • $\begingroup$ Well, in this case a helpful user has pointed out in a flag that this same question appears on brainly.in where it seems to have been posted a few months ago. $\endgroup$ – Gareth McCaughan Jun 27 at 22:34
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I believe the answer is

4, as the numbers in each row decrease from left to right, and alternate between being a power of a number and not being a power of a number.

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    $\begingroup$ How do I hide my answer under a spoiler box? $\endgroup$ – Danne Jun 7 at 17:58
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    $\begingroup$ Please see edit — the syntax is >! (both characters). Hope this helps! $\endgroup$ – El-Guest Jun 7 at 18:16

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