As the expected unit for density is the same as it is given for mass and volume, you simply divide the mass by the volume and you will get the required value as 12.68 g/mL.
The unit cannot be g mL. It has to be g/mL (read as gram per milli litre)
39.17g/3.09ml = 12.676g/ml
3917 km
And by biggest...you mean widest? Or longest? The top 5 LONGEST rivers in the world are, in order of longest to not as long: 1. Nile River - 4135 miles long 2. Amazon River - 3980 miles long 3. Chang Jiang (Yangtze) River - 3917 miles long 4. Mississippi-Missouri River - 3870 miles long 5. Yenisay River - 3434 miles long The width of a river can vary, as it is normally not the same 100 miles down, or however long it is. The widest river however is credited to be Rio de la Plata, in South Africa. It can get to be as wide as 140 miles in some parts. I hope this all helps!!
It has a density of about 12.68 g/mL
I'll assume you mean g/mL, so 3917g / 309 mL = 12.676 g/mL
There are 1.609344 kilometres in one mile. Therefore, rounded to two decimal places, 3917 kilometres is equal to 3917/1.609344 = 2433.91 miles.
3917
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The Bold and the Beautiful - 1987 1-3917 was released on: USA: 4 November 2002
Days of Our Lives - 1965 1-3917 was released on: USA: 28 April 1981
734- 658-3917
734- 658-3917
3917 miles
Absolutely NOT! nostradamus' predictions go on until the year 3917!