The diagonals would be perpendicular (intersect at a 90* angle)
The last 2 shapes.
When you rotate both of them 360 degrees only at 180 and back at 360 it looks same.
Start from the end. 5+4*2. Which in turn equals 18 inches.
Answer:

Step-by-step explanation:
The exponential function that decrease by 15% every time x increases by 1 is given by:

We simplify the parenthesis to get:

Therefore the decrease by 15% every time x increases by 1 is

The second choice is correct.