Final answer:
To convert the weight from kilograms to pounds, multiply the weight in kilograms by the conversion factor of 2.2 pounds per kilogram. Rounded to the nearest pound, Lucas weighs approximately 172 pounds.
Step-by-step explanation:
To convert the weight from kilograms to pounds, you can use the conversion factor of 2.2 pounds per kilogram. Multiply the weight in kilograms (78) by the conversion factor:
78 kg * 2.2 lb/kg = 171.6 lb
Rounded to the nearest pound, Lucas weighs approximately 172 pounds.