Q: Premise: "A young woman wearing a dress makes an awkward hand sign."
Hypothesis: "A young woman is throwing up gang signs as she drives through the ghetto."
Do we know that the hypothesis entailed by the premise?
A: A woman throwing up gang signs knows what she is doing with her hands and can't be said to be making awkward hand signs.
The answer is no.

Q: Premise: "A man is on a ladder leaned up against a building."
Hypothesis: "The ladder has 7 rungs."
Do we know that the hypothesis entailed by the premise?
A: Being on a ladder doesn't imply it has also 7 rungs.
The answer is it is not possible to tell.

Q: Given the sentence "The older woman is talking to the child." is it true that "They are not speaking."?
A: One who is talking cannot be said to be not speaking.
The answer is no.

Q: Premise: "A man riding on the back of a trash truck."
Hypothesis: "The man is a city sanitation employee."
Do we know that the hypothesis entailed by the premise?
A:
Sentence one states the man is riding in the back of a trash truck. Just because he is a sanitation employee doesn't mean he rides in the back of a trash truck.
The answer is it is not possible to tell.