Students were asked to evaluate 16 + (-20) on a quiz. Greg answered 4, Sydney answered -36, and Devon answered -4. Which student is correct?

Devon is correct. Sydney would be correct if 16 was a negative. However, it is not. Devon is correct because he added -20 to 16, which is just as good as subtracting 20 from 16. This would simplify to -4.

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

idk

step-by-step explanation: