Ineed it is really difficult i’m not the greatest t chemistry me

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Is 9 correct? and can someone me with 10? it’s due tomorrow, you