Michael has 5 boxes. there are 5kg of apples in each box. when empty, a box weighs 5-2 kg.

As I understand from the given above, each box when empty weighs 5-2 kg or 3 kg. To determine the total weight of Michael's boxes when empty, we just have to multiply 3 kg by 5. This gives us an answer of 15 kg. Thus, the total mass of Michael's boxes is 15 kg. 

no can not find the distance between two point using absolute value

hope this help:)