Final answer:
A weighing machine measures your weight and shows it as mass, assuming Earth's gravity. Your mass is 42 kg if the scale is accurate and well-calibrated, and it would stay the same regardless of location, such as the Moon.
Step-by-step explanation:
When you stand on a weighing machine, it measures your weight and then it is calibrated to show your mass. This conversion assumes the acceleration due to gravity is 9.80 m/s². If the machine is accurate and well-calibrated, your mass is reported as 42 kg. However, mass is a measure of the amount of matter and does not change with location. On the Moon, your weight would change, but your mass would be the same. If a weighing scale was taken to the Moon, it would not read accurately unless it was recalibrated for the Moon's gravity. Therefore, under normal Earth conditions, assuming there are no scale malfunctions or calibration issues, your mass is 42 kg.