6. [2.66/4 Points] PREVIOUS ANSWERS SCALCEV1 2.7.019. 1/6 Submissions Used The cost (In dollars) of producing x units of a certain commodity ls given below. 600 = 9000 + 6x + 0.1x2 (3) Find the average rate of change of C with respect to x when the production ls changed from x = 100 to the given value. (i)x = 105 s (ii)x = 101 s mm (b) Find the instantaneous rate of change of C with respect to x when x = 100. (This is called the marginal cast.) 3:\" 8. [-/4 Points] DETAILS 0/6 Submissions Used MY NOTES Consider the function below. Use it to find the following limits. (If an answer does not exist, enter DNE.) f (x) = 13-x2 if x 3 (a) lim f (x) (b) lim f (x) (c) lim f (x) I-+3 (d) lim f (x) z-+9 Submit Answer. [0/4 Points] PREVIOUS ANSWERS 5/6 Submissions Used MY NOTES The graph of the function H(x) is shown below. Use the graph to answer the following. Find the value(s) ofx where the function is discontinuous, i.e. not continuous. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) x: (3,3)