Answer:
22
Step-by-step explanation:
x-1 is a midsegment.
According to the Triangle midsegment theorem, x-1 is half of the third side (42)
x-1 = 42/2
x-1 = 21
x= 22
or
2x-2=42
2x=44
x=22
Hope this helps!
The answer is 9. there are 9 different combinations to choose from.
I feel like there is something missing from this question, for example how large is the tree house? If these are just plain measurements, then I would opt for B.