Answer: The distance between two points is √73.
And the unit vector in the direction of a = i − 9j + 3k is a= (i − 9j + 3k)/√91.
Sep-by-step explanation:
The formula for distance between two points is=√{(x2-x1)^2+(y2-y1)^2+(z2-z1)^2} and unit vector a^=a/|a|