How to use right hand riemann sum give a table

The video tutorial explains how to calculate R6 using right endpoints. It begins with an introduction to the concept, followed by visualizing the graph and understanding the common difference. The instructor then explains how to start from the right endpoint and work backwards, ensuring the correct number of intervals. The method is simplified, and the final result is calculated and approximated. The session concludes with a question posed to Alex.

Describe the process of working backwards from the right endpoint as mentioned in the text.

What is the final approximate answer given in the text?