Destroyer 2013 question?!

[vsa1991]

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Can someone help me understand #67 and #75 in the QR section of the destroyer? I looked at the answers but it's still not making sense.
I'm also not getting #131 in the OChem section.

Thanks!

 

[Daneosaurus]

I have the 2014 version, idk if the questions are the same. Is #66 doubling of a mice population; #75 ln|tan(theta)|?

 

[ToBeDDSS]

QR math destroyer or DAT destroyer?

 

[KineticFlow603]

What year is the destroyer from?

 

[vsa1991]

QR math destroyer or DAT destroyer?

Its the DAT destroyer

 

[vsa1991]

Its 2013

QR math destroyer or DAT destroyer?

 

[Dotoday]

What was question 131 there?