JoFe is producing a "How I made it through UB guide" to help students cope with all the many challenges. The publisher advises that 130 copies will cost $819, and 160 copies will cost $999. What is the marginal cost? Answer: [x+y 3 -1 2y z 0 2 3 and B = -1 If A = if it is possible, determine the value of x such that A = B 4 5 0 O a. -2 O b. 5 O. 2 O d. It is not possible O e. 0