question: can you please help me understand this equation

1 . Hello , and welcome to the Orientation section of your course . This set of problems will introduce you to many of the features that you might see as you work through this course* This problem will highlight some of the helpful features that are available in most problems . When you are practicing problems in the Study Plan , or working on a Homework assignment , the problems are broken up into steps , which are displayed one at a time* Some steps do not require you to enter an answer . After you have read the information in one of these steps , click the Continue button to advance to the next step . When an active step requires you to enter an answer or answers before advancing to the next step . you can check whether the answer ('s ) in the current active part are correct by clicking the Check Answer button .* Type the number I in the following answer box ." Click the Animation button and watch the " How to Enter Answers " tour . Then try some of the other learning aids . Careful : The Help ME Solve This link will give you information about solving the problem you are working on , but then when you close that link , it will reload the exercise , requiring you to start over with a similar but different problem* Some questions will contain information , like charts or tables , in a popup step . To open the popup , click on the icon or the text of the hyperlink , as directed . "Click the icon to view the correct answer , OR click here to view the answer . Type the number shown in the popup . You have completed this problem ." You can either go on to the next problem , or you can try a similar version of this problem , if additional attempts are allowed by your instructor , by clicking Similar Question* 1 : Answer to the following question The answer is 4 . 2 : Answer to the following question The answer is 4