Suppose there are two residents in a neighborhood, Tana and Jason. Tana's demand for clean streets is Q = 100 - 4P. Jason's demand for clean streets is Q = 80 - 2P. If your answer is not a whole number, please make sure to round to the nearest hundredth. Use this information to answer the next 5 questions. Question 18 1 pts Find the social demand curve for clean streets in this neighborhood. What is the slope of the social demand curve? Question 19 1 pts Find the social demand curve for clean streets in this neighborhood. What is the yintercept of the social demand curve? (Do not enter a dollar sign in your answer) Question 20 1 pts What is the socially optimal number of clean streets if the marginal cost of cleaning them is $35? Question 21 1 pts What is the socially optimal number of clean streets if the marginal cost of cleaning them is $5? Question 22 1 pts What is the socially optimal number of clean streets if the marginal cost of cleaning them is $95