Answer:
i think because if t = 12, t will not satisfy the first and last equation (in the first equation, t<6 and in the last equation t> 12)
so t = 12 only satisfy the second equaton with 6≤t≤12
Explanation:
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because if t = 12, t will not satisfy the first and last equation (in the first equation, t<6 and in the last equation t> 12)