The circle below is centered at the point (1, 2) and has a radius of length 3.
What is its equation?
O A. (x-1)2 + (y + 2)2 = 9
O B. (x - 2)2 + (1-1)2 = 32
O C. (x - 2)2 + (y + 1)2 = 9
O D. (x-1)2 + (y-2)2 = 32
10

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.