Multiply four and eight tenths multiplied by three. thirteen and one tenth
thirteen and four tenths
fourteen and two tenths
fourteen and four tenths

Step-by-step explanation to

(4 + 2/5)3

(4x3) + (2/5x3)

12 + 1 1/5

13 and 1/5 or 2/10

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