Greetings!

1. When do numerals takes the genitive singular in Old Norse and Icelandic, please?
E.g. Fimm manns fórust í sprengjutilræði á Filippseyjum

2. Please can someone explain the exact meaning of the following.
What is the role of the word verði here, please?
Clinton segir að styðja verði vopnaeftirlit með nýrri S.Þ.-ályktun

Cheers,

Simon