Use compatible numbers to estimate 5 × 1,021 a. about 10,000 b. about 7,000 c. about 2,000 d. about 5,000

the correct answer is D

Step-by-step explanation:

5 x 1,021 = 5,105

i'm not sure i quite understand, could you provide more information?

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