How much is ARB in dollars?

Excuse me, could you please clarify the context for this question? Are you referring to a specific cryptocurrency or token named ARB, and are you asking for its current exchange rate in US dollars? If so, the answer would depend on the current market conditions and trading volumes, as cryptocurrency prices can fluctuate significantly over time. I would recommend checking a reputable cryptocurrency exchange or price aggregator to get the most up-to-date information on the ARB to USD exchange rate.