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??

it's the 3rd one. Notice that it's the only one that will produce a (-6a) term. :)

LOL. Alright im in the mood haha
18. c
19. b
20. you can do it!

Is it, c? Cause thats what I got when I worked it out.

nope. the roof will will u a 70x^2 term, the skyline will give you a 3x^2 term, subtracting...

d?

nope. its a. its Area(roof)-Area(skyline)

a. just a wild educated guess haha

yeah. its a

Thank you so much! I give you a medal:)

thanks! :)