How do I express these in scientific notation AND Log10 form?

1) ln(8.1)
2) 32.8 x 10^-2 + 3.15 x 10^-1
3) 10^-2 x 10^4.5
4) 10^-45
5) 8^2.34

Please show some effort, and please stop posting under multiple names.

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