Question

is sodium ethoxide a good base or nucleophile?

how do we know if the solvent is involved in the reaction? For example, if there is excess sodium iodide in ethanol, both would react with - in this problem specifically - 2-bromo-methylbutane should i assume anything with a spectator ion to be a nucleophile? But why is sodium methoxide a strong base? do you have a lecture that covers this idea?