16. If D is the triangular region in the xy-plane with vertices (-2,1), (1,1), and (1,4), then

A. 5

B. 19/3

C. 9

D. 21/2

E. 11

 

Solution: The answer is C

 

The following is the graph of region D:

 

Using the graph, we can rewrite the double integral as follows: