Be not anxious (μη μεριμνησητε). First aorist active subjunctive with μη in prohibition. Do not become anxious. See a similar command to the Twelve on their Galilean tour (Matthew 10:19) and in the great discourse on the Mount of Olives at the end (Mark 13:11; Luke 21:14), given twice by Luke as we see.

How or what ye shall answer (πως η τ απολογησησθε). Indirect question and retaining the deliberative subjunctive απολογησησθε and also ειπητε (say).