1,2,4,8 I might of missed something
Answer:
C. 
Step-by-step explanation:
Iterative geometric sequence:

Recursive geometric sequence:

The equations are very similar and you only really need to rearrange it. The factor (2/3) and the first term (9) are given, so you can write the iterative equation:

And so the answer is C.
Answer:
28
Step-by-step explanation:
Add the top and bottom bases, divide by 2, multiply by height.