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Let's break down the problem step by step.

### Problem Overview:
We are given a table with different masses \(x\) (in grams) and the corresponding lengths \(l\) (in centimeters) of a spring when subjected to these masses. The goal is to:

1. **Determine a linear model** \( L(x) = ax + b \), which describes the spring length as a function of the mass.
2. **Explain how well the model fits the measurements** (the data points from the table).
3. **Interpret the constant \(b\)** in the model.

### Table of values:
The table shows:
- **Mass of the load (x in grams)**: \(20, 40, 60, 100, 200, 500\)
- **Length of the spring (l in cm)**: \(15.5, 19.8, 24.1, 31.7, 51.9, 112.5\)

---

### a) Find the Linear Model \(L(x) = ax + b\)

To find the linear model, we use the general form of a line \(L(x) = ax + b\), where:
- \(a\) is the slope (the rate at which the spring's length changes with respect to mass),
- \(b\) is the intercept (the length of the spring when the mass is zero).

We can calculate \(a\) and \(b\) using **linear regression** or by calculating the slope between two points and using one point to find \(b\).

**Approach:**
1. **Calculate the slope (a)**: The slope can be found by picking two points, say \((x_1, l_1)\) and \((x_2, l_2)\), and using the formula:

\[
a = \frac{l_2 - l_1}{x_2 - x_1}
\]

2. **Find the intercept (b)**: Once we have the slope, we can use any point, say \((x_1, l_1)\), to find \(b\) using:

\[
l_1 = ax_1 + b \quad \Rightarrow \quad b = l_1 - ax_1
\]

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### b) Explain the Meaning of \(b\)
The constant \(b\) represents the length of the spring when the mass attached is zero. It is essentially the natural length of the spring without any load.

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Let me proceed with the calculations for \(a\) and \(b\). Would you like a detailed explanation for each step?

En fjeder belastes med forskellige lodder i fysiklokalet. I tabel 1 ses sammenhørende målte værdier for massen af loddet og fjederens længde. Massen måles i gram, og længden af fjederen i centimeter.

Learn how to create a linear model L(x) = ax + b to describe the relationship between mass (in grams) and spring length (in cm). The problem uses data from a physics experiment and introduces linear regression to calculate the slope and intercept. Suitable for Grades 10-12.

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