Chapter 12 - Data Analysis and Probability - 12-2 Frequency and Histograms - Practice and Problem-Solving Exercises - Page 737: 39

$=\begin{bmatrix} -2.1 & -5.3\\ -6.7& -0.5 \\ \end{bmatrix}$

$\begin{bmatrix} 0.2 & 0.6\\ 0.8 & 0.5 \\ \end{bmatrix}$ $-\begin{bmatrix} 2.3 & 5.9\\ 7.5& 1.0 \\ \end{bmatrix}$ $=\begin{bmatrix} -2.1 & -5.3\\ -6.7& -0.5 \\ \end{bmatrix}$