A school principal to observe how the natural circulation of air has an affect on Classroom morning. The principal randomly chooses a group of students of same age and grade and places them in a room with open windows the test scores of the classes are recorded and analyzed the end of the semester. How could this observation be changed into a valid experiment effects of air circulation

Scenario: susan wants to make 2 square flags to sell at a crafts fair. the fabric she wants to buy is 3 meters wide. she doesn't want any fabric left over. what's the least amount of fabric she should buy? question: which equation will susan solve her problem? note: let x represent the length of 1 side of the flag. options: 1) 2x^2 = 4x 2) 8 +2x = 2(4x) 3) 2 * 2 = 4 * 2 4) 4x^2 -2x = 0