Answer:
12
Step-by-step explanation:
if you combine the triangles (1/2) you get 6 since they are 0.5 of a unit divide by two = 3 add to 9 =12
Answer:

Step-by-step explanation:
Area is the width (6/7 yd) multiplied by the height (1 yd).
6/7 x 1 = 6/7 
19 is a prime number so 1, 19
hope this helps!
Answer:
3,
3x+5
Step-by-step explanation:
DIFFERENTIATE W.R.T. X
3
EVALUATE
3x+5
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.