Explain it

12-matrix-operations — 2 short write-ups

Question 1 of 2

A checkpoint, not a test

Explain addition and scaling

A short written check using original parallel practice. This is portal practice, not a Canvas course grade.

Matrices A and B are both 2 × 3. Explain how to compute 2A − B, including what happens to a negative entry of B. Why would the same expression be undefined if B were 3 × 2?

Describe matching positions and the order of the operations.

Question 2 of 2

A checkpoint, not a test

Explain a product entry

A short written check using original parallel practice. This is portal practice, not a Canvas course grade.

A quantity matrix Q has 2 rows (shops) and 3 columns (products). A price matrix p is 3 × 1 in the same product order. Explain why Qp is defined, its size, and what entry (2, 1) means. Describe how to calculate that entry.

Track the row label, matching product positions, and units.