If you rotate about the circumcentre of a regular polygon 72° it will overlap with the original image.
Step-by-step explanation:
4+6+5=15
15-1=14
2/14
1/7
Answer:

Step-by-step explanation:
In order to add or subtract numbers in scientific notation, the powers of ten must have the same exponent. In this caes the diameter of an average human body cell is a power of -4 and the diameter of a plant cell is a power of -3. In order to add them, we can move the decimal over for the body cell diameter:

Add the two values: 