1)
What was the question "Mah Shakai Ki Na'avdenu"?
1.
Malbim: They deny Hashem's existence.
2)
What was the question "u'Mah No'il Ki Nifga Bo"?
1.
Rashi: What benefit will we get via requesting 1 from Him? We do not need Him, even for rain - "Ed Ya'aleh Min ha'Aretz"!
2.
Malbim: Even if He exists, what will it help to request from Him? They deny Hashgachah, and say that He does not hear Tefilah and act based on people's actions.
1
Ibn Ezra: Nifga is like "v'Al Tifga Bi."
