Multiply these polynomials.

(2x2 + 3x)(6x2 - 4x - 5)

a. 12x4 + 18x3 - 22x2 - 15x
b. 12x4 + 10x3 - 22x2 - 15x
c. 12x4 + 10x3 - 12x2 - 15x
d. 12x4 + 18x3 - 12x2 - 15x

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.