Calculate (To Three Significant Figures)the Numerical Part of the Conversion

Essay

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