136) A rectangle has Its base on the x -airs and its upper two vertietes vertices on the parabola 4 = 4 - x 2, what is the largest possible. area of the rectangle.3.4 3.9 3.6 3.7 Limits at Infinity; Horizontal Asymptotes 231 Summary of Curve Sketching 244 Graphing with Calculus and Calculators 251 Optimization Problems 258 An vil refinery is located on the north bank of a straight river that is 2 km wide . A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river 6 km east of the refinery. The Cost of laying pipe is $400, 000/ km over larand to a point P on the north bank and & 800, 000 / km under the river to the tanks. To minimize the cast of the pipeline, where Should P be located