I suppose <em>K</em> is the matrix

To compute det(<em>K</em>), you can use a simple cofactor expansion along the first row:

Answer:
$1224
Step-by-step explanation:
72 adults in the theater, and 17$ per adult ticket.
72 x 17 is 1224.
16/2 : the first one
Step-by-step explanation:
You take how many treats in all and divide by the number of treats to find how many dogs visited.