Final answer:
To convert 31 pounds to kilograms, multiply the number of pounds (31) by the conversion factor (0.45359237) to get 14.0610547 kg. After rounding to the nearest tenth, the final answer is 14.1 kg.
Step-by-step explanation:
To convert 31 pounds to kilograms, we use the conversion factor where 1 pound is approximately equal to 0.45359237 kilograms. Therefore, we multiply the number of pounds by this conversion factor.
31 lb × 0.45359237 kg/lb = 14.0610547 kg
Next, we identify the least precise measurement. Since we want our final answer rounded to the nearest tenth, it will be expressed to the 0.1 decimal place. Thus, the answer should be rounded to the tenths place, giving us 14.1 kg.