2. Distance is to mile as mass is to a. litre b. gravity c. scale d. kilogram

Distance is to mile as mass is to kilogram because both pairs represent measurements in their respective domains. Just as a mile quantifies distance, a kilogram quantifies mass, making them essential units for understanding spatial and physical properties. When thinking about measurements, it's essential to know the correct unit to use in various contexts. Common mistakes include mixing units—like using grams for something measured in kilograms—which can lead to confusion. Always double-check which unit is appropriate for the measurement you’re dealing with!