Here is the question: Here's the answer provided for the book: I guess I'm just confused as to how to properly get there

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Here is the question:

Here Is The Question Here S The Answer Provided For The Book I Guess I M Just Confused As To How To Properly Get There 1 (8.04 KiB) Viewed 329 times

Here's the answer provided for the book:

Here Is The Question Here S The Answer Provided For The Book I Guess I M Just Confused As To How To Properly Get There 2 (4.08 KiB) Viewed 329 times

I guess I'm just confused as to how to properly get there. From
the question to the conclusion. Please include all steps and a
brief explanation if necessary!
1.3.20. If a new row vt is added to A, what is the change in ATA?
1.3.20 ATA is increased by vot