The seismic activity density of a region is the ratio of the number of earthquakes during a given time span to the land area affected. The table below shows the land area and seismic activity density for two states.

\begin{tabular}{|r|r|r|}
\hline
& Land Area [tex]$\left(\text{mi}^2\right)$[/tex] & Seismic Activity Density \\
\hline
State A & 163,696 & 0.0299 \\
\hline
State B & 10,931 & 0.1402 \\
\hline
\end{tabular}

Which statement about the number of earthquakes the states had for the given time span is true?

A. State A had approximately 1,533 more earthquakes than State B.
B. State B had approximately 1,533 more earthquakes than State A.
C. State A had approximately 3,362 more earthquakes than State B.
D. State B had approximately 3,362 more earthquakes than State A.



Answer :

Let's determine the number of earthquakes in each state based on the provided land area and seismic activity density.

Given data:

- Land area of State A: 163,696 square meters.
- Seismic activity density of State A: 0.0299.
- Land area of State B: 10,931 square meters.
- Seismic activity density of State B: 0.1402.

To find the number of earthquakes in each state, we multiply the land area by the seismic activity density.

### Step-by-Step Solution:

1. Calculate the number of earthquakes for State A:

[tex]\[ \text{Number of Earthquakes in State A} = \text{Land Area of State A} \times \text{Seismic Activity Density of State A} \][/tex]
[tex]\[ = 163,696 \times 0.0299 \][/tex]
[tex]\[ = 4894.5104 \][/tex]

2. Calculate the number of earthquakes for State B:

[tex]\[ \text{Number of Earthquakes in State B} = \text{Land Area of State B} \times \text{Seismic Activity Density of State B} \][/tex]
[tex]\[ = 10,931 \times 0.1402 \][/tex]
[tex]\[ = 1532.5262 \][/tex]

3. Calculate the difference in the number of earthquakes between State A and State B:

[tex]\[ \text{Difference} = \left| \text{Number of Earthquakes in State A} - \text{Number of Earthquakes in State B} \right| \][/tex]
[tex]\[ = \left| 4894.5104 - 1532.5262 \right| \][/tex]
[tex]\[ = 3361.9842 \][/tex]

After performing the calculations, we can conclude the following:

- State A had approximately 3,362 more earthquakes than State B.

Thus, the correct statement is: State A had approximately 3,362 more earthquakes than State B.