71 I (4x3 W 6\"\") dx 7 1 3. Find the average value of f (x) = 49:3 $ over [1,4]. 4. The cost per unit of a certain model of 4k TV's is decreasing at the rate of C'Ct) = \\/E 4- due to the maturity of the manufacturing process after t months. This TV model will only be produced for 4 years before being discontinued. If the current cost per unit of this 4k TV is $750 (t = D) in the beginning of the 1st year Uanuary 1\"). What would be the cost per unit of this 4k TV model at the end of the 3rd year [December 3 15*)