Example 6, in particular, shows that there's two kinds of people in this world, TI-85 (old) and TI-86 (young). Whereas they show the results of TI-86 to be "as expected", I would have expected the results of TI-85 myself. Guess I'm getting old!
:-)
I'm also an engineer who used the TI-85 nearly 20 years ago so I know how the orders work in that calculator which is not consistent with almost all programming languages and newer generation calculators most of which listen to Auntie BEDMAS.
Here's to old guys!