Which values represent the dependent variable?

the dependent variable is the thing you are measuring and the independent variable is the one that you change that affects the DV.

so the dependent variable in this case is the y as this is what you are finding when you manipulate x.

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

d is correct

step-by-step explanation: