can you help my sis out agan sorry

Answer:
[tex]5.1[/tex]×[tex]10^{-4}[/tex]
[tex]6.3[/tex]×[tex]10^{-3}[/tex]
Step-by-step explanation:
If you move the decimal 4 times to the right, since it's a negative, you'll get the number 0.00051.
If you move the decimal 3 times to the right, since it's also a negative, you'll get the number of 0.0063.
Hope this helps!