Answer:
(i) \[28.7pm=28.7\times
{{10}^{-12}}m\]
\[=2.87\times
{{10}^{-11}}m\]
(ii) \[15.15pm=15.15\times
{{10}^{-12}}m\]
\[=1.515\times {{10}^{-11}}m\]
(iii) \[25365mg=25365\times
{{10}^{-6}}kg\]
\[=2.5365\times
{{10}^{-2}}kg\]
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