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# Problem #1: Find x3x 2 9 3 dx B. The marginal cost for producing x units of a product is given by 0.003x 2 2 x 20 dollars per unit. If the cost to...

Here i need help on question #1. open the accach file and do #1. please do it following the step that i post.

**1) Problem A- Using substitution**

**a. (0.5 points) Identify the u, and du/dx. Explain WHY you chose the u you did. No explanation, no points.**

**b. (1 point) Change the integral from one in terms of x to one in terms of u. Be careful to use correct notation (don't drop the integral sign or the du). Explain this process. No explanation, no points.**

**c. (0.5 points) Find the antiderivative of integral in b. Explain this process. No explanation, no points.**

**d. (0.5 points) Put antiderivative back in terms of x and report solution to original problem. Don't forget the + C!**

**2) Problem B (2 points) You MUST explain your process for this one. Just showing your work is NOT enough. Explain what you did and why at each step. No explanation, no credit.**