Answer:
It will take C. 180 years to grow 720 millimeters.
Explanation:
The research shows that Mount Everest grows and average of 4 millimeters each year.
In order to calculate how many years it will take to grow 720 millimeters, we need to divide 720 millimeters by the average of 4 millimeters each year.
If we calculate it :
[tex]\frac{720mm}{4\frac{mm}{year}}=180years[/tex]
We found out that it will take 180 years. Therefore, the correct option is C. 180
