Which of the following is another way to express the problem 1 - (-7)? -1 + (-7)
1 + (-7)
1 + 7
-1 + 7

I am pretty sure that the answer it (1+7) but i do not know for sure.

Step-by-step explanation:

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

b

step-by-step explanation:

the word superfluous means unnecessary