Instructions: please enter your name, id number, form designa- Tion letter, and index number on the op-scan sheet. The index number should be written in the upper right-hand box labeled course. in the box labeled form, write the appropriate test form letter. Darken the appropriate circles for your id number and form designation. Mark your answers to the test questions on rows 1-14 of the op-scan sheet. You have one hour to complete this part of the nal exam. Your score on this part of the exam will be the number of correct answers. Please turn in the op-scan sheet with your answers and this question sheet at the end of this part of the exam: consider the function f (x, y) = xy 3x + 4y 12. 1: consider the function f (x, y) = x3 2x + y y2. The value of rrd y da is (1) -4/3. (2) 4. (3) 3/2. (4) 2.