[tex]-13[/tex] > [tex]-21[/tex] ( [tex]-13[/tex] is greater than [tex]-21[/tex]).
[tex]-13[/tex] is warmer.
The reason why is because -21 is further away from 0 than -13. Negative numbers are greater when they are closer to 0, and less when further away.
[tex]-13[/tex] is greater than [tex]-21[/tex]
[tex]-13[/tex] > [tex]-21[/tex]
Therefore, [tex]-13[/tex] is warmer
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