I am struggling with these questions. Please help me, thank you so much!

4. Create a function where the critical points are at x = 1 & - 2 and there is an inflection point at x = -1. Prove your function correct by taking derivatives and solving. 5. Find both a revenue and cost function that each has highest power 2. Find the functions for marginal cost, marginal revenue and marginal profit. 6. Use the following graph to answer parts a-f: - W 4 5 6 7 8 Find the intervals of a. Concave up b. Concave down c. Increasing d. Decreasing Find the following e. Critical points f. Inflection points