Answer the following questions. Show all work. (6 pts) 1. If y= 3.x - 5 d'y 3.x + 8 -. find dr' (5 pis) 2. If an object's position, in yards, after f minutes, is given by s() =850-80r + 2 + 3r, find the object's acceleration after 2 seconds. (Make sure to label the units.) 3. I sell small tables for $180 each. Each week, it costs me (2000+14x +0.5x ) dollars to make x tables. (4 pts) a. Find the marginal cost for making 12 tables. (5 pts) b. Find the marginal profit for making 12 tables