Premise:
"The city walls, like much of the Old City are composed of stones from many parts of the city's long history."
Hypothesis: The walls are made from stones similar to the ones used to build the Old City.

yes

Premise:
"Here's a tip, failure to attribute phrasing means plagiarism."
Hypothesis: All phrasing that hasn't been attributed to a source is plagiarism.

it is not possible to tell

Premise:
"For LSFO installation timing, it is expected that one system requires about 27 months of total effort for planning, engineering, installation, and startup, with connections occurring during normally scheduled outages."
Hypothesis: The LSFO installation timing will take about 27 months.
yes