Step-by-step explanation:
2250mg = 2250/1000 = 2.25g
59.4kilolitres = 59.4 ×1000 = 59400litres
0.000072g = 0.000072x 1000000 = 72micrograms
3.98 x 10^6 in = 3.98 × 10^6 × 25.4 × 10^-6 = 1.01092 × 10^2 km
or
3.98 × 10^6 m = 3.98 × 10^6 × 10^-3 = 3.98 × 10^3
