Question 3 - 15 marks This question is based on your work on MU123 up to and including Unit 5. In this question, you are asked to comment on a student's incorrect attempt at answering the question detailed below. The question (i) Simplify the following expression as far as possible, showing all your work- ing: Ty - 12 - 3y + 32. (ii) Solve the following equation, showing all your working: (+ + 9) = 28. The student's incorrect attempt: (2) Given: Zy - 12 - 34 + 32 Group Like terms: = Zy - 3y - 12 + 32 Collect Like terms: = 4y+ 20 Subtract 20: - 20 = 44 Divide by 4: -5=y The solution is y = - 5. (Li) Given: = (t + 9) = 28 Clear the fraction: 2(t + 45) = 140 Multiply by 2: 2t + 90 = 140 Subtract 90: 2t = 50 Divide by 2: t = 25 The solution is t = 25. (a) The student has made a mistake in both parts of their attempt. Identify these mistakes and explain, as if directly to the student, why, for each mistake, their reasoning is incorrect. [4] (b) Write out your own solution to each part of the question, explaining your working. [6]