31/2 + ( -6 1/2) =
5/8 - {-2/8} =
- 9/10 - 2/5 =
6 3/5 - (-2 1/5)

-3 1/2 + ( -6 1/2) =  -10

5/8 - {-2/8} =  7/8

- 9/10 - 2/5 =  -4

6 3/5 - (-2 1/5) = 44/5

Step-by-step explanation:

-3 1/2 + ( -6 1/2) =  -7/2 + (-13/2) = -20/2 = -10

5/8 - {-2/8} =  5/8 + 2/8 = 7/8

- 9/10 - 2/5 =  -18-2/5 = -20/5 = -4

6 3/5 - (-2 1/5) = 33/5 + 11/5 = 44/5

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2