Dissolved in water to make 100 ml of solution,  .017 moles  of nacl would have a concentration ofa.1.71 m. c.0.0171 m. b.0.171 m. d.17.1 m.

The answer is doing. 17.1M

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it