Answer and Explanation:
(1) A dominant strategy is a strategy selected by one player regardless of the other player 's strategy.
According to the question
United dominant strategy is to Advertise, as it contains higher payoff ($9,000 > $1,000 and $16,000 > $11,000).
While on the other hand, Delta dominant strategy is to Advertise, as it contains higher payoff ($9,000 > $1,000 and $16,000 > $11,000).
(2) If Delta advertises, the best option for United is to advertise as the payout is higher($9,000 > $1,000).
If Delta does not advertise, the better option for United is to advertise as the payoff is higher($16,000 > $11,000).
The best strategy for Delta as United Advertises is to advertise because the payoff is higher ($9,000 > $1,000).
If United doesn't advertise, the best strategy for Delta is to advertise as the payoff is higher($16,000 > $11,000).
Hence Nash equilibrium is: (United Advertises, Delta Advertises)