If a figure is dilated by a factor of 5/6 ,the perimeter of the figure will change by a factor of

Step-by-step explanation:

The dilation will affect every side by a factor of 5/6

The perimeter of the image:

The factor will be same: 5/6

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)