Pregunta
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The following inequality is given: \( -4 \leq-\frac{1}{2} m<5, m \in R \) 3.2.1 Solve for \( m \). 3.2.2 Represent the answer in 3.2.1 on a number line.

Ask by Erickson Lee. in South Africa
Mar 16,2025

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\( m \) is greater than \(-10\) and less than or equal to \(8\).

Solución

1. Start with the inequality \[ -4 \leq -\frac{1}{2} m < 5. \] 2. Multiply every part of the inequality by \(-2\). Remember that multiplying by a negative number reverses the inequality signs: - Multiplying the left side: \[ -4 \times (-2) = 8, \] so the left inequality becomes \[ 8 \geq m. \] - Multiplying the right side: \[ 5 \times (-2) = -10, \] so the right inequality becomes \[ m > -10. \] 3. Combining these results, we have: \[ -10 < m \leq 8. \] 4. On a number line, this interval is represented by an open circle at \(-10\) (indicating that \(-10\) is not included) and a closed circle at \(8\) (indicating that \(8\) is included), with a shaded line connecting them. Thus, the solution for \( m \) is \( -10 < m \leq 8 \).

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Bonus Knowledge

To solve the compound inequality \( -4 \leq -\frac{1}{2} m < 5 \), we can break it into two parts. 1. For the left side \( -4 \leq -\frac{1}{2} m \): \[ -4 \times -2 \geq m \quad \text{(multiplying by -2 reverses the inequality)} \] This gives us \( m \leq 8 \). 2. For the right side \( -\frac{1}{2} m < 5 \): \[ -2 \times -\frac{1}{2} m < -2 \times 5 \quad \text{(again, multiplying by -2 reverses the inequality)} \] This gives us \( m > -10 \). Combining both parts, we have: \[ -10 < m \leq 8 \] For the number line representation, draw a horizontal line. Place an open circle at -10 (indicating that -10 is not included) and a closed circle at 8 (indicating that 8 is included). Shade the region between -10 and 8 to represent all values of \( m \) that satisfy the inequality.

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