Ann works for a city's parks and recreation department. She is looking for some commercial land to rezone for recreational use and has found two possible options.
Part A
Ann's first option is a plot of land adjacent to a current park. The current park is a square, and the addition
will increase the width by 200 meters to give the expanded park a total area of 166,400 square meters.
This equation represents the area of the first option, where x is the side length of the current square park:
x2 + 200x = 166,400.
Use the most direct method to solve this equation and find the side length of the current square park.
Explain your reasoning for both the solving process and the solution.

The survey of study habits and attitudes (ssha) is a psychological test that measures the motivation, attitude toward school, and study habits of students, scores range from 0 to 200. the mean score for u.s. college students is about 115, and the standard deviation is about 30. a teacher who suspects that older students have better attitudes toward school gives the ssha to 55 students who are at least 30 years of age. the mean score is 113.2. assume the population standard deviation is 30 for older students what is the margin of error for a 95% confidence interval for the population mean score for a. older students? b. compute the 95% confidence interval for the population mean score for older students. c. compute the 99% confidence interval for the population mean score for older students. d. compute the 88% confidence interval for the population mean score for older students.