\fQUESTION 7 Compute the following limit, or show that it doesn't exist. Make sure to justify your answer in full. 12 - 2cy + y- lim (I,y) (0,0) QUESTION 8 Compute the following limit, or show that it doesn't exist. Make sure to justify your answer in full. lim y sin(I) (z,y) .(0,0) +1 QUESTION 9 Let f(x, y) = 027 (a). Find the domain of f. (b). Determine whether the values 0, 1, and -1 are in the range of f. Justify your answer. (c). Find and sketch the level curves S(x, y) = ! and f(x, y) = . You may draw all of them in the same plane. (d). Compute the following limit, or show that it doesn't exist. Justify your answer. lim f(x, y) (z,y) +(0,0) (e). (Optional; extra credit, 5 points.) Find the range of f. Justify your