Adog runs from point o to b. the dog reaches a at 2.3 s into the sprint. then the dog reaches c at 4.1 s. what is the average velocity of the dog from a to c?

It is 3.2 because you add 2.3 and 4.1 then divide your answer by 2.

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.