Please help asap

The Physics Club at Foothill College sells Physics Show sweatshirts at the yearly Physics Show event. A quadratic regression model based or previous sales reveals the following demand equation for the sweatshirts: q = -p2+ 33p +9; 18sps 28 On a separate sheet of paper that you will scan and upload, please answer the following questions: A) Determine the price elasticity of demand E when the price is set at $20. SHOW WORK. B) Is demand elastic or inelastic at a price of $20? What will happen to revenue if we raise prices? Explain. C) At what price should sweatshirts be sold to maximize revenue? SHOW WORK. D) How many sweatshirts would be demanded if they were sold at the price that maximizes weekly revenue? SHOW WORK. E) What is the maximum revenue? SHOW WORK