1)
How did He bless them?
1.
Radak: With money.
2.
Malbim: With property.
2)
How did they increase?
1.
Radak, Malbim: They had many children.
3)
Why does it say "u'Vhemtam Lo Yam'it"?
1.
Radak: Their animals did not miscarry, and all the more so their wives.