Question

?

Answer 1

You have to use the equation to find a distance between two points:
p(x,y) = sqrt(x2-x1)^2+(y2-y1)^2)

Answer 2

p(x,y) = sqrt( (400--200) ^2 + (-100-100)^2)
p(x,y) = ~632.455km

For the direction, you plug the two points in a plan and voila! :)

Answer 3

units are in hundreds
find equation of line by finding slope then using point-slope form
y-y1 = m(x-x1)

for direction, tan theta = 3 --> theta = 71.565 South by East