Put the words in parentheses into the genative case and translate: muti (principes) in urbem fugere cupiunt.

Question

Latin 

Answer 1

"Genitive" is spelled with an i.

I'm assuming you mean multi. The genitive plural is attested as both principium and principum (see Elem. Lewis).

A translation would be:

many of the chiefs wish to flee into the city.

Answer 2

With the word muti, which would mean silent, you may have a poetic political statement.

mūtī principium in urbem fugere cupiunt. "Those of the leaders who were silent desired to leave the city". This could have been the dissenting political fraction who didn't feel safe to speak out or stay with the current political climate wished to get out of town. Context of the rest of the passage would give us more clues as to

Answer 3

muti principium in urbem fugere cupiunt. muti ?? Maybe multi?? not muti.  

 

So,  Many of the Princes (leaders) want to flee into the city.

principes is Nominative and Plural so the genitive would be principum. Sometimes may be written principium. It is third declension.