Question:
When some of their capital is invested in Treasury securities, the interest is related to their cost of operations in the same way as the revenue earned from selling services.

Does it follow that "They cannot invest any capital in Treasury securities."?
Answer:
no

Question:
But it is a shame, in an age of blockbuster publishing, that Lukas' editors either did not or could not prevail upon him to lighten up, on himself and on his audience.

Does it follow that "Unfortunately for Lukas his publishers failed to insist that his work take a less serious tack."?
Answer:
yes

Question:
What kind of office software will you need?

Does it follow that "What kind of office software do you need to set up for the business?"?
Answer:
it is not possible to tell

Question:
Where only recently there were virgin beaches, now mile upon mile of concrete vacation complexes line the strand until you reach El-Alamein, a 90-minute drive along the coast.

Does it follow that "There are no vacation accommodations until you reach El-Alamein. "?
Answer:
no