Question
The usual form for $2.3 \times 10^{-10}$ is ____________.

Answer

The usual form for $2.3 \times 10^{-10}$ is $0.00000000023.$
Solution:
For usual form, $2.3 \times 10^{-10}=0.23 \times 10^{-11}=0.00000000023$
Hence,
The usual form for $2.3 \times 10^{-10}$ is $0.00000000023.$

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