Does the sentence "Different observers may calculate different distances and different time intervals between two events, but the invariant interval between the events is independent of the observer (and his velocity)." provide a valid answer to the question "The invariant interval between events is independent of what?"

A: yes

Does the sentence "At the academy, he met Abdel Hakim Amer and Anwar Sadat, both of whom became important aides during his presidency." provide a valid answer to the question "What allies did Nasser meet at the Academy?"

A: no

Does the sentence "As Jay Cross, the chief scientist of the Internet Time Group, remarked, "Connectedness begets vulnerability."" provide a valid answer to the question "What organization does Jay Cross belong to?"

A: yes

Does the sentence "West Raleigh lies along Hillsborough Street and Western Boulevard." provide a valid answer to the question "Where is West Raleigh?"

A:
yes