Between what 2 consecutive integers does /191 lie 10 and 11 11 and 12 12 and 13 13 and 14

I must assume that you meant "sqrt(191)."  

What's the first perfect square greater than 191?  196 = 14^2
What's the first perfect square smaller than 191?    169 = 13^2

Note how  169 < 191 < 196.  Thus, the square root of 191 lies between 13 and 14.

Distance=slopeslope is -2/4which equals-1/2the distance between these two points is -1/2