Question

when calculating the doubling time, we use the rule of 70:
\frac{70}{r}=doubling time
what does r stand for?
growth rate
death rate

Explanation:

The Rule of 70 is used in population growth (a concept in the field of social science, specifically related to demography which can be considered under the 'Others' sub - category of Social Science). In the formula \(\frac{70}{r}=\text{Doubling Time}\), \(r\) represents the growth rate. The growth rate is the key factor that determines how quickly a population (or other growing quantity in a similar context) will double. The death rate is not relevant in this formula for calculating doubling time as it focuses on the increase (growth) aspect.

Answer:

Growth rate