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

7.35×109
7.35 times 10 superscript 9 baseline

12.3×109
12.3 times 10 superscript 9 baseline

8.25×109
8.25 times 10 superscript 9 baseline

3.3×109

Answer 1

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

1. Population in 1500 CE: \( 4.5 \times 10^8 \)
2. Population in 2020: \( 7.8 \times 10^9 \)

Now we perform the subtraction:

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

To do this, we need to express both terms using the same power of 10. We can express \( 4.5 \times 10^8 \) as \( 0.45 \times 10^9 \):

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

Calculate the subtraction:

\[ 7.8 - 0.45 = 7.35 \]

Now, combine it back:

\[ 7.35 \times 10^9 \]

Thus, the increase in the world’s population from 1500 CE to 2020 is \( 7.35 \times 10^9 \).

The correct response is:

7.35×10^9