Answer:
either 21 or 39 ion know this is confusing
Step-by-step explanation:
9 decimeters. deci = 0.1
9 *0.1 meters.
0.9 meters
9 decimeters = 0.9 meters.
The sum of a polygon's angles are 540.
When you add all the angles together here, you get 456.
Now subtract 456 from 540.
540 - 456 = 84
In a scientific notation, it would be: 1.5 × 10⁻⁸
In short, Your Answer would be 1.5 × 10⁻⁸
Hope this helps!
