The number of gallons of gas that were in the tank minus 9 leaves 3 gallons

I expect u wanna find the number of gallons ni the tank initially. If so, your answer is 12 gallons.

Step-by-step explanation:

Let the number of gallons in the tank be x.

Then,

x  - 9 =3

x -9 +9 = 3+9

x       = 12

Hope i helped u :p

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

-6 is the correct option from the above given options