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. A state had 424 earthquakes over a given time span and a land area of 71 comma 300 square miles. What is the seismic activity density for this state? Round to the nearest ten thousandth, if necessary.
Answer
A
168 point 1 6 0 4 earthquakes per square mile
B
0 point 0 0 4 6 earthquakes per square mile
C
0 point 0 0 5 9 earthquakes per square mile
D
179 point 0 0 4 9 earthquakes per square mile
Explanation
Seismic activity density is the number of earthquakes divided by the land area: 424 ÷ 71,300 ≈ 0.005946 earthquakes per square mile. Rounded to the nearest ten-thousandth, this is 0.0059 earthquakes per square mile, so the correct choice is 0.0059 earthquakes per square mile.
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