1. Find the absolute extrema of f(x) = Isl-4 x2 on [1.2], if there are any, and determine the 1iralues of x at which the absolute extrema occur. 2. A closed box with a square base is to have a volume of 2000 in3 . The material for the top and bottom of the has cost 3%] pesos per square inch and the material for the sides cost 15 pesos per square inch. Find the dimensions of the boat so that the total cost of material is least