A metal sample is hammered into a rectangular sheet with an area of 31.2 ft2 and an average thickness of 2.30 x 10-6 cm. If the density of this sample is 7.15 g/cm3, calculate the mass of the sample in grams (g).

16- counting by fours

60.0 - there are 3 significant numbers

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.