Answer:
yes, yes, no, yes, yes (x > 0)
Explanation:
the longest side must not be greater than the other 2 sides added up.
5 + 7 > 8 (yes)
10 + 3 > 11 (yes)
16 + 5 = 21 (no)
4 + 1.4 > 5 (yes)
3x + 4x > 5x (yes, x > 0)
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