Answer :

[tex]1.75\times10^{-9}\\\\use\ a^{-n}=\frac{1}{a^n}\\\\therefore\ 10^{-9}=\frac{1}{10^9}=0.000000001\\\\1.75\times10^{-9}=1.75\times0.000000001=0.00000000175[/tex]

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