Final answer:
The question as presented lacks the necessary information about restrictions and critical points to find the maximum and minimum values of the equation C = 2(x+y). Optimization techniques would normally be applied, but without that information, the question cannot be answered.
Step-by-step explanation:
To find the maximum and minimum values of the equation C = 2(x+y) given some restrictions, we need information about the critical points and the restrictions themselves which are not provided in the question. However, the equation implies that the cost (C) is directly proportional to the sum of x and y. Without further information on the restrictions or the critical points, we cannot accurately determine the maximum and minimum values for C. Typically, in optimization problems like this, one would use techniques such as setting the derivative equal to zero to determine critical points, and then apply the second derivative test or plug in the values into the original equation to find the maxima and minima. Since these details are missing in the problem statement, the question cannot be answered as is.