<ul data-eligibleForWebStory="true">The first algorithm analyzed has a time complexity of O(N^2) due to N x N steps.The second algorithm's time complexity is determined to be O(N^2) through mathematical calculations involving summations.The third algorithm's time complexity is found to be O(N log(N)) based on the multiplication by 2 for each while iteration.The fourth algorithm's time complexity is revealed to be O(N) as the geometric series converges to 2.