Three.
1370 month = 41670 days
All of them.
It has 1 significant figure.
0.004 has 1 significant figure.
0.3 has one significant figure.
The last four are significant.
1 significant figure. It can also be written as 4x10^6 (one sig fig)
Two significant figure
One significant figure.
10 significant figures.
One significant figure
1 significant figure.