9 e. CuBr

two nonmetals? no
metal with more than one charge? yes
calculate the charge of the metal that can have more than one charge.

Br is negative one and there is one Br so the total negative charge is -1; the total positive charge must be +1 and since there is only one Cu, that one Cu must have a charge of +1; use Roman numeral in parentheses to indicate the charge of the metal that can have more than one charge.

binary compound so use ending -ide with name of nonmetal

copper (I) bromide