Adrop of gasoline has a mass of 22 mg and a density of 0.754 g/cm3. what is its volume in cubic centimeters?

1.22 mg is the same as .022 grams. One gram equals 1000 mg. Convert mg to grams  by dividing mg by 1000mg/gm. Volume = mass over density. Volume equals .022 grams over .754 grams/cm3 which equals .029 or .03cm3. 2.weight in kg times gravity constant. Weight in newtons equals 10kg times 9.8m/s2 that equals 98 newtons. 

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.