Answer
a - 5.91 x $10^{6}$ mg
b - 7.53 x $10^{5}$ µg
c- 9.01 x $10^{4}$ kHz
d - 4.98 x $10^{-4}$ kJ
Work Step by Step
a - 5.91 kg to milligrams
5.91 kg = 5.91 kg x $\frac{10^{3}g}{1kg}$x $\frac{10^{3}mg}{1g}$ = 5.91 x $10^{6}$ mg
b - 753 mg to micrograms
753 mg = 753 mg x $\frac{1g}{10^{3}mg}$ x $\frac{10^{6}µg}{1g}$ = 753 x $10^{3}$ µg
753 mg = 7.53 x $10^{5}$ µg
c - 90.1 MHz to kilohertz
90.1 MHz = 90.1 MHz x $\frac{1Hz}{10^{-6}MHz}$ x $\frac{10^{-3}kHz}{1Hz}$ = 90.1 x $10^{3}$ kHz
90.1 MHz = 9.01 x $10^{4}$ kHz
d - 498 mJ to kilojouls
498 mJ = 498 mJ x $\frac{1J}{10^{3}mJ}$ x $\frac{10^{-3}kJ}{1J}$ = 498 x $10^{-6}$ kJ
498 mJ = 4.98 x $10^{-4}$ kJ
