i have the following question and i'm looking for explaination on how to do it step by step.

i do have the answers already but i need to know how did we get these answers.

QUESTION A2: Monopolistic Competition and Oligopoly i. List and explain the three key attributes of monopolistic competition. ii. The USA and China are locked in negotiations to cut emissions. The following table represents the pay-offs from cutting emissions and continuing to pollute: China Pollute Cut Emissions Pollute USA = $1mil USA = $2.5mil USA China = $1.5mil China = $1mil Cut Emissions USA = $0.8mil USA = $2mil China = $2.4mil China = $1.8mil (a) If the USA plays its dominant strategy, what is its payoff at the Nash Equilibrium? (b) What is the Nash equilibrium for each country