Final answer:
To estimate the size of the crowd, calculate the area of the crowd space and divide it by the number of people that fit in a given area. The estimated size of the crowd lining Peachtree Street is 25,200 people.
Step-by-step explanation:
To estimate the size of the crowd lining both sides of Peachtree Street, we need to calculate the area of the crowd space. Since the crowd is 15 feet deep, we can assume that the width of the crowd space is 15 feet. The length of the crowd space is 7 miles, which is equal to 7 x 5280 = 36960 feet. Therefore, the area of the crowd space is 36960 x 15 = 554,400 square feet. If 22 people fit comfortably in a 10 x 10 ft. area, we can calculate how many people can fit in 1 square foot by dividing the area by the number of people. So, 554,400 / 22 = 25,200 people. Hence, the estimated size of the crowd is 25,200 people.