Final answer:
To estimate the number of people in a 400-foot line for a concert, assume about 1 person per 2 feet, leading to an estimate of around 200 people.
Explanation:
Estimating the number of people in a line: To estimate the number of people in a line that is about 400 feet long for a concert, you can use a rough average of 1 person per 2 feet. This estimation assumes people are standing relatively close together without much space between them. Therefore, you can estimate that there are around 200 people in the line (400 feet divided by 2 feet per person).
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