The joint cost (in dollars) for two products is given by 
, where x represents the quantity of product X produced and y represents the quantity of product Y produced. Find the marginal cost with respect to x if 2 units of product X and 9 units of product Y are produced.
?
A. 
B. 
C. ?
D. ?
E. ?
Answer: B
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Find all the second order partial derivatives of the given function.f(x, y) = 
A. 
= - 
; 
= 
; 
= 
= 
B. 
= - 
; 
= 
; 
= 
= 
C. 
= 
; 
= - 
; 
= 
= 
D. 
= - 
; 
= 
; 
= 
= 
Solve the problem.A ceramics workshop makes serving bowls, platters, and bread baskets to sell at its Winter Festival. A serving bowl takes 3 hours to prepare, 2 hours to paint, and 9 hours to fire. A platter takes 16 hours to prepare, 3 hours to paint, and 4 hours to fire. A bread basket takes 4 hours to prepare, 17 hours to paint, and 7 hours to fire. If the workshop has 119 hours for prep time, 84 hours for painting, and 122 hours for firing, how many of each can be made?
A. 9 serving bowls, 5 platters, 3 bread baskets B. 5 serving bowls, 3 platters, 9 bread baskets C. 10 serving bowls, 6 platters, 4 bread baskets D. 3 serving bowls, 9 platters, 5 bread baskets
Classify the angle.
A. Acute B. Right C. Obtuse D. Straight
Establish the identity.sec(2?)= 
What will be an ideal response?