Need help with SI units, scientific notation if appropriate

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Answer the following in the proper SI units, scientific notation if appropriate. Assume exactly 365 days per year. 

1.) 124.1 g  +35 mg=?

2.)  23m^2 + 345.7 ha=? 

3.) 6.6079 x 10^15 cm^3 / 6km^2 

Additional question: for these questions... how do we know what unit to convert to? I.e., in question 1 there is mg and grams? does it matter which unit to convert to or can we do either? 

Oct 22nd, 2015

Thank you for the opportunity to help you with your question!

1. 124.1 g + 35 mg ...convert both to grams

1 gram =1000 mg


124.1 + 0.035=124.135g

2. 23m^2 + 345.7ha.....convert  m^2 to ha

 1 m^2 = 0.0001 ha

     23m^2            ?.....................=0.0023 ha

0.0023ha+ 0.035g= 0.0373 ha

3. a mkinute please!...time run out but will follow asap!

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 22nd, 2015

3.  6.6079 x 10^15 cm^3 / 6km^2...unfortunately, you cannot compare Km^2 with Cm^3. one of for length whereas the other is for volume!

Oct 22nd, 2015

To your last question, we can begin from any point when deciding what to convert to what! but to avoid handling huge figures, it's advisable to consider the part which will reduce the figure, thus, convert smaller units to larger units.

Oct 22nd, 2015

What would scientific notation in consideration with significant digits be for 1 and 2? 

Oct 23rd, 2015

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