Read the professor’s PPT and answer the reaction paper The course name is Enviro

Read the professor’s PPT and answer the reaction paper
The course name is Environmental Economics
Reaction paper
Please solve the following questions.
 Suppose the demand curve and supply curve for a good are represented by D = -P+100 and S = 9P, respectively. Here, D is quantity demanded, S is quantity supplied and P is price.
① What is the equilibrium price?
② What is the equilibrium quantity (demand and supply at equilibrium) ？
③ How much is the consumer surplus in the equilibrium?
④ How much is the producer surplus in the equilibrium?
⑤ How much is the social surplus in the equilibrium?
Please upload the Word file (DOC, DOCX), if possible.