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Here are the answers to Even More Problems with Sig Fig and Scientific Notation. This is just the answer and not the required number/units before you round to the correct number of Sig Figs or Column/decimalplace.
1) 72 m/min
2) 2.33E5 m-sec
3)9.4 gal/hr
4) 1.68E10 g/sec
5) 1.11E-8 sec2