Answer:
I have already answered this in your last question:)
Answer:
5√10
Step-by-step explanation:
The distance between two points A(
) and B(
) on the coordinate plane is given by:

From the image attached the coordinates of the points are E(-1, -1), F(8, -4), C(-7, -4) and D(-1, 2).
Hence the lengths of the line segment EF and CD are:

3 and 2/9. You just multiply 9 by 3 to get 27 and put the remaining 2 over 9