1. Using the matrices A and B from Problem 1.1, compute AB. Do not use a computer program. Do it with pencil and paper. 2. Let A, B, C, D be matrices defined by Which of the following matrices are...

1. Using the matrices A and B from Problem 1.1, compute AB. Do not use a computer program. Do it with pencil and paper.

2. Let A, B, C, D be matrices defined by

Which of the following matrices are defined? Compute those matrices which are defined.