Hey there! :D
3,942,588
The thousandths is where the 2 is.
If the number behind the 2 is 5 or greater, we round up to 3.
It is, so round up:
3,943,000 <== rounded number
I hope this helps!
~kaikers
I did it wrong the first time you're answer is b. 11*11^4
I believe its 80 if you derive it out, but there is no units of measurement.