What is the answer for 4-8 and 6 is optional.. show work.. you(need answer asap)

4. 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

The answer is 41.7 because 1.39 times 30 is 41.7