state what you are computing, what you use to compute it, and what the result 15. C. [10 pts] The region R is bounded by 2x - y' - 2y = 1, x - y' - 2y = 2, x + 4y = 2, and y = -1/2. If R is the base of a solid and cross-sections through the solid taken parallel to the r-axis are equilateral triangles, determine the minimum number of integrals needed to express the volume of the solid. (B D more than 4 E None of these Explanation: Additional Directions: Your explanation must include a picture. You are v me to import an image from Desmos directly into this document