I need q 4 and 5 please:)

Aland development company purchases several acres of land adjacent to a wildlife reserve. it plans to build a new community, complete with shops and schools. green sands, a local environmental group, complains that the company's proposed building methods will disrupt the area's ecological balance. the company wants to respect the local ecology but also wants to build its development. the company decides to schedule a meeting with green sands's representatives to make choices about the property that are agreeable to both sides. which strategy would be most effective in this situation?

Afinancing project has an initial cash inflow of $42,000 and cash flows of −$15,600, −$22,200, and −$18,000 for years 1 to 3, respectively. the required rate of return is 13 percent. what is the internal rate of return? should the project be accepted?

When a company produces and sells x thousand units per week, its total weekly profit is p thousand dollars, where upper p equals startfraction 800 x over 100 plus x squared endfraction . the production level at t weeks from the present is x equals 4 plus 2 t. find the marginal profit, startfraction dp over dx endfraction and the time rate of change of profit, startfraction dp over dt endfraction . how fast (with respect of time) are profits changing when tequals8?