1. The problem is to understand and calculate Body Mass Index (BMI) using the formula: $$\text{BMI} = \frac{\text{mass (kg)}}{\text{height (m)}^2}$$ 2. This formula calculates BMI by dividing a person's mass in kilograms by the square of their height in meters. 3. Important rules: - Mass must be in kilograms. - Height must be in meters. - Height is squared, meaning height multiplied by itself. 4. Example calculation: Suppose a person weighs 70 kg and is 1.75 m tall. $$\text{BMI} = \frac{70}{1.75^2} = \frac{70}{3.0625}$$ 5. Simplify the fraction: $$\text{BMI} = 22.857$$ 6. Interpretation using the classification table: - Less than 18.5: Underweight - 18.5 to 24.9: Healthy weight - 25 to 29.9: Overweight - Over 30: Obese 7. Since 22.857 is between 18.5 and 24.9, this person is classified as having a Healthy weight. This method can be used to calculate BMI for any mass and height values and classify the result accordingly.