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Solve the following and express the resu...

Solve the following and express the result to an appropriate number of significant figures:
(i) Add 6.2g, 4.33g, and 17.456g.
(ii) Subtract 63.54kg, from 187.2kg. (iii) 75.5 xx 125.2 xx 0.51.
(iv) `(2.13xx24.78)/(458.2)` (v) `(2.51xx10^(-4)xx1.81xx10^(7))/(0.4463)`

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