The Categorical Imperative is supposed to provide a way for us to evaluate moral actions and to make moral judgments. It is not a command to perform specific actions -- it does not say, follow the 10 commandments, or respect your elders.
A blurb on a book can be any combination of quotes from the work, the author, the publisher, reviewers or fans, a summary of the plot, a biography of the author or simply claims about the importance of the work.
This is an example. A stem and leaf plot is a plot where numbers with more than two digits are broken down into parts. The numbers in the tens spot is put on the left side of the vertical line. The numbers in the ones spot is on the right of the vertical line. For instance, on the top of the chart, there is a 9. On the other side of the line, there is a zero.