Item # 7. 20 pts An open rectangular tank of length 3x meters, width 2x meters and height h meters is to be constructed using a piece of thin metal with an area of 4.2 square meters. https://ateneo.instructure.com/courses/19987/quizzes/85779/take 4/6 3/23/22, 5:00 PM Quiz: Long Test 2 Items and Timer Page (opens at 5 PM) a. Use the surface area of the tank to express h in terms of x. [5] b. Find the width that will make the volume of the tank a maximum. [12] c. What is the maximum volume? [3]