In 1500 CE, the world’s population was about 4.5×108

Question

. In 2020, the world’s population was about 7.8×109
. Find how much the world’s population increased. (1 point)
Responses

8.25×109
8.25 times 10 superscript 9 baseline

7.35×109
7.35 times 10 superscript 9 baseline

12.3×109
12.3 times 10 superscript 9 baseline

3.3×109

Answer 1

To find how much the world’s population increased from 1500 CE to 2020, you can subtract the population in 1500 from the population in 2020.

Population in 2020: \( 7.8 \times 10^9 \)
Population in 1500: \( 4.5 \times 10^8 \)

Now, we perform the subtraction:

\[ 7.8 \times 10^9 - 4.5 \times 10^8 \]

To subtract these numbers, they need to be expressed with the same exponent. We can convert \( 4.5 \times 10^8 \) to a form that has the same exponent as \( 7.8 \times 10^9 \):

\[ 4.5 \times 10^8 = 0.45 \times 10^9 \]

Now we can subtract:

\[ (7.8 \times 10^9 - 0.45 \times 10^9) = (7.8 - 0.45) \times 10^9 = 7.35 \times 10^9 \]

So, the increase in the world’s population from 1500 CE to 2020 is:

7.35×10^9