Maths-
General
Easy
Question
The line graph shows the total length, in miles, of major commercial railroad tracks in the United States from 1916 to 1976
Length of Major Commercial Railroad Tracks in the United States
The average rate of change, in miles per year, of the total length of major commercial railroad tracks in the United States from 1916 to 1926 is m. What is the value of m ?
The correct answer is: 2400 (in miles per year)
The total length of track in 1916 = 397,000 miles (given in graph)
The total length of track in 1926 = 421,000 miles (given in graph)
The change in total length of track = 421,000 miles - 397,000 miles = 24,000 miles.
No.of years = 1926 -1916 = 10 years .
The average rate of change = change in total length / no.of years
⇒ 24,000 miles / 10 yr = 2,400 (miles per year )
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