No, only multiples of 10 end in a 0
hope this helps :)
It is shown that he goes down in a slower time than he does going up.
1) graphs y = -9x + 12 and y = 1/3x - 12 are not coincident.
2) The graphs are not parallel, because the angular coefficients are not equal
3) The condition of perpendicularity:
, where 
- not perpendicular