Premise:
"(2) For investments in marketable securities, the term refers to the value of such securities determined by prices quoted on securities exchange markets multiplied by the number of bonds or shares held in an investment portfolio."
Hypothesis: The term, when is referring to investments in marketable securities, is the value of such securities determined by particular prices.

yes

Premise:
"We haven't had sex, but a frolic or two has occurred."
Hypothesis: We haven't had sex yet because something always came up.

it is not possible to tell

Premise:
"But there's no time for regrets now."
Hypothesis: There is nothing to regret about it.
no