Answer:
Below
Step-by-step explanation:
1.
[tex]4.2*10^{-1}[/tex]
2.
[tex]2.875*10^{3}[/tex]
3.
[tex]1.4031 *10^{6}[/tex]
4.
[tex]8.3*10^{-2}[/tex]
If you need help understanding why you move the decimal places, you can ask in the comments. :).
