1 a.  1/9  1/9  1/9
      1/9  1/9  1/9
	  1/9  1/9  1/9
  b.  convolution
  c.  Yes. The convolution result will produce pixels with noise reaped.
  d.   0 -1 -1
      -1  1  1
	   1  1  0
2  12.5/d = (12.5+80/72)/(d+0.5)
   d = 5.625 inches