Here are some more challenging problems without solutions:
If you are having any trouble with these
problems, it is recommended that you review the orthogonality
tutorial at the link below. Although these problems are a
little more challenging, they can still be solved using the same basic
concepts covered in the tutorial and examples.
To test your knowledge of these application problems, try taking the
general orthogonality test on the iLrn website or the
orthogonality test at the link below.