Premise: "Punk rock teenager walks with a mean look on his face."
Hypothesis: "The happy teenager had a smile on his face."
Do we know that the hypothesis entailed by the premise? Step by step answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The teenager cannot have a smile on his face and a mean look on his face at the same time. Therefore, the final answer is no.