Question

in 2017, the estimated world population was 7.5 billion. use a doubling time of 45 years to predict the population in 2025, 2071, and 2119.

what will the population be in 2025?

the population will be 8.5 billion.
(round to one decimal place as needed.)

what will the population be in 2071?

the population will be 17.2 billion.
(round to one decimal place as needed.)

what will the population be in 2119?

the population will be billion.
(round to one decimal place as needed.)

Explanation:

State the exponential growth model

Using the Exponential Growth and Doubling Time knowledge points

$$ P(t) = P_0 \cdot 2^{t / T_d} $$

$$ P_0 = 7.5,\quad T_d = 45,\quad t = \text{Year} - 2017 $$

Calculate the population in 2025

Using the Exponential Growth knowledge point

$$
LATEXBLOCK0
$$

Calculate the population in 2071

Using the Exponential Growth knowledge point

$$
LATEXBLOCK1
$$

Calculate the population in 2119

Using the Exponential Growth knowledge point

$$
LATEXBLOCK2
$$

Answer:

Question 1

The population will be 8.5 billion.

Question 2

The population will be 17.2 billion.

Question 3

The population will be 36.1 billion.