Explained the modified line through a comment.
edited to first equation comment to be grammatically correct.

Added comment to second equation to explain what it does.
added explanatory comment for the console output.
added explanatory comment for the console output.
Created a variable to store needed gallons of water.
Explained line of code works.
Added a console output to show how many gallons of water will be needed.
created an alert that will also display the necessary on one line for the user.
Added space for sentence formatting in the alert window.
Added comment to explain the purpose of the new alert window.
added console.log to display the final alert in the console as well.
Explained new line of codes purpose in a comment.
Added comments to label complete sections of code.