Answer:
9 units
Step-by-step explanation:
To find the length of a side of a square, you need to square root the area
√81 = 9
Answer:

Step-by-step explanation:
Given : One nanometer equals about 0.00000004 inches.
To find : When writing this decimal as a single-digit integer multiplied by a power of ten, the single digit integer is and the power of ten ?
Solution :



Therefore, the decimal as a single-digit integer multiplied by a power of ten is 
It would have to be X + 8
both towns are the same length because they are the same distance away from each other.