I am utterly stalled on the last one, and I think my not understanding something in the next-to-last is making it harder.
Va fdhner gjb, V gubhtug gur oenpxrgrq-fvk zrnag "sbyybj gur vafgehpgvbaf va fdhner gjb bs tevq fvk", ohg gubfr vafgehpgvbaf ner "hc hc yrsg yrsg", juvpu vf abg cneg bs gur cngu gung fdhner gjb vf ba. Nz V zvfvagrecergvat jung gur oenpxrgrq-fvk zrnaf?