1)
Why does it say "Shachechu Kel Moshi'am"?
1.
Radak: They said "Eleh Elohecha Yisrael" (Shemos 32:8).
2.
Malbim: They saw that Hashem, the Cause of causes, conducted them, for He was "Oseh Gedolos b'Mitzrayim." Gadol shows that He is the source of all matters. They saw this in Egypt - "b'Zos Teda Ki Ani Hashem" (Shemos 7:17).
