pls help on these questions from homework! these are 'Completing the Square' application word problems from a math textbook, I still don't get it at all. #19,22,23.

Digging Roots, a First Nations band, 1 . from Barriere, British Columbia 19. The manager of a bike store is setting the price for a new model. Based on past sales history, he predicts that if he sets the price at $360, he can expect to sell 280 bikes this season. He also predicts that for every $10 increase in the price, he expects to sell five fewer bikes. a) Write a function to model this situation. b) What maximum revenue can the manager expect? What price will give that maximum? c) Explain any assumptions involved in using this model. 3.3 Completing the Square . MHR 195X L X 1 2 - - - 23. Use a quadratic function model to solve each problem. a) Two numbers have a sum of 29 and a product that is a maximum. Determine the two numbers and the maximum product. b) Two numbers have a difference of 13 and a product that is a minimum. Determine the two numbers and the minimum product. 24. What is the maximum total area that 450 cm of string can enclose if it is used to form the perimeters of two adjoining rectangles as shown?22. A set of fenced-in areas, as shown in the diagram, is being planned on an open field. A total of 900 m of fencing is available. What measurements will maximize the overall area of the entire enclosure? X L X y 23. Use a quadratic function model to solve each problem. a) Two numbers have a sum of 29 and a product that is a maximum. Determine the two numbers and the maximum