Answer
A) 3,138,000 Joules
B) 3,138 Kilojoules
Work Step by Step
To answer the item A, you need to understand that a value of 750 kcal is needed for the long walk, so, to have the value in Joules, we need to multiply 750 kcal by $10^{3}$ and after that multiply it by 4,184 to convert to Joules.
