Find the perimeter of the image below: figure pqrst is shown. p is at negative 2, 11. q is at negative 4, 5. r is at 2, 0. s is at 1, 7. t is at 8, 7. 37 units 38 units 39 units 40 units

For this case, the first thing to do is to graph the ordered pairs and join the points.
 Then, we use the formula of distance between points:
 
 We have then:
 
 For TP:
 
 

 For PQ:
 
 
 
 For QR:
 
 

 For RS:
 
 

 For ST:
 
 

 Then, the perimeter of the figure is the sum of the lengths:
 
 Rounding off we have:
 

 
 the perimeter of the image is:
 39 units