Calculate (to three significant figures) the numerical part of the conversion factors needed to carry out the following unit conversions:
a. density in g/cm3 to kg/m3
b. speed in mi/h to ft/s
c. area in km2 to mi2
d. area in km2 to cm2
e. mass/area of aluminum foil in mg/cm2 to g/m2
f. number of gas molecules per unit volume from /m3 to /ft3
g. number of bacteria per unit area on a microscope slide from /mm2 to /in2
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