The lives of people are spoken of as if they are as insignificant as shadows. AT: "Everyone disappears like shadows do" (See: [[rc://en/ta/man/translate/figs-simile]])
Here it is implied that they do not know what will happen to their wealth after they die. The full meaning of this statement can be made explicit. (See: [[rc://en/ta/man/translate/figs-explicit]])
The writer asks this question to emphasize that people cannot help him. This rhetorical question can be translated as a statement. AT: "So now, Yahweh, I can expect to receive nothing from anyone else." (See: [[rc://en/ta/man/translate/figs-rquestion]])