Which ones is it? Correct will get branilist

Answer:
[tex] 5.99 \times {10}^{ - 9} \\ \\ 1.80 \times {10}^{9} \\ \\ 3.42 \times {10}^{ - 9} [/tex]
Step-by-step explanation:
Following numbers are written in scientific notations.
[tex]5.99 \times {10}^{ - 9} \\ \\ 1.80 \times {10}^{9} \\ \\ 3.42 \times {10}^{ - 9} [/tex]