1. The problem asks to change questions 8, 9, 10, 15, 16, 17, 23, and 24 by matrices. 2. Since the user did not provide specific questions, I will explain how to represent typical algebraic problems as matrix problems. 3. Matrices are rectangular arrays of numbers that can represent systems of linear equations, transformations, or data. 4. For example, a system of linear equations like: $$\begin{cases} 2x + 3y = 5 \\ 4x - y = 1 \end{cases}$$ can be written as a matrix equation: $$\begin{bmatrix} 2 & 3 \\ 4 & -1 \end{bmatrix} \begin{bmatrix} x \\ y \end{bmatrix} = \begin{bmatrix} 5 \\ 1 \end{bmatrix}$$ 5. This matrix form allows us to use matrix operations to solve for $x$ and $y$. 6. Without the original questions, I cannot convert them exactly, but this is the general method to change algebraic questions into matrix form. 7. If you provide specific questions, I can convert them into matrices accordingly.