Write 6(x â€" 5)4 4(x â€" 5)2 6 = 0 in the form of a quadratic by using substitution. 6u2 4u 6 = 0, where u = x â€" 5 6u2 4u 6 = 0, where u = (x â€" 5)2 6u4 4u 6 = 0, where u = x â€" 5 6u4 4u 6 = 0, where u = (x â€" 5)2.

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.