Question

use an annual growth rate of 0.6% in a 20 year period for a certain population to find the approximate doubling time and then predict the population in 2050, based on a 2000 population of 4.0 billion.

what is the approximate doubling time?
117 years
(round to the nearest whole number as needed.)

what will be the approximate population in 2050?
billion
(round to the nearest tenth as needed.)

Explanation:

Calculate the approximate doubling time

Using the Rule of 70 and Doubling Time knowledge points

$$ T_{\text{double}} \approx \frac{70}{r} = \frac{70}{0.6} \approx 116.67 \text{ years} \approx 117 \text{ years} $$

Calculate the population in 2050

Using the Exponential Growth knowledge point

$$
LATEXBLOCK0
$$

Answer:

Question 1

117

Question 2

5.4