What is the sum of (1.3 × 10-7) and (-3.8 × 10-3)?
a. 2.5 × 10-10
b. -2.5 × 10-4
c. 3.8 × 10-3
d. -3.8 × 10-3

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

step-by-step explanation:

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