SOLUTION: Suppose a utility considers demand for electricity "low" if it is below 5 mkW (million kilowatts), "average" if it is at least 5 mkW but below 10 mkW, "high" if it is at least 10 m

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Question 1125226: Suppose a utility considers demand for electricity "low" if it is below 5 mkW (million kilowatts), "average" if it is at least 5 mkW but below 10 mkW, "high" if it is at least 10 mkW but below 40 mkW, and "critical" if it is 40 mkW or more. Express these demand levels in interval notation. (low, average, high, and critical)
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
low = [0,5)
average = [5,10)
high = [10,40)
critical = [40,+infinity)

[0,5) translates to 0 <= x < 5
[5,10) translates to 5 <= x < 10
[10,40) translates to 10 <= x < 40
[40,+infinity) translates to 40 <= x < +infinity

x represents the demand for electricity.

the assumption is that the demand can't be less than 0 and that it has no upper limit.

here's a reference on interval notation.

http://www.coolmath.com/algebra/07-solving-inequalities/03-interval-notation-01