Answer:
Perimeter is 38.8 units and approximately 39 units
Step-by-step explanation:
Given: Graph
To find: perimeter of the polygon
Solution:
Distance between points
is given by 
As per the graph,
point P is (-2,11)
point Q is (-4,6)
point R is (2,0)
point S is (1,7)
point T is (8,7)

Perimeter refers to sum of lengths of all the sides.
Perimeter = 
Or approximately 39 units
8.64 - 3.15 = $5.49 if this is what you are asking
$52 because 4 times 12 equals 48 so 100 minus 48 equals 52