Verified Answer :

  1. 28.5 squared centimeter
    5. height=18 ft
    7. The triangle will be bigger. Since this scale factor is 4, then that means that the 2-D plane will be bigger.
    8. The perimeter will get bigger.

i'm not sure if i understand the question but if i understand it right it goes like this...
4-8+6
4-8=-4
-4+6=2
so the answer is 2

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