Answer:
D. ![\left[\begin{array}{ccc}-12&-4\\9&3\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-12%26-4%5C%5C9%263%5Cend%7Barray%7D%5Cright%5D)
Step-by-step explanation:
In order for a matrix to be singular, the determinant has to be zero.
Answer:
5 * 5 * 5 /5 i think
Step-by-step explanation:
if this is wrong sorry and ill delete my answer-
Let's work on the triangle first. The x intercept of 2y=27-3x is
0 = 27 - 3x
3x = 27
x = 9
So A(9,0)
B is the meet of 2y=27-3x and y=3x
2y=27-y
3y=27
y=9
y is the height of OAB; we don't really need x
Area(OAB) = 
Now we have to subtract
Area = 40.5 - 24.3 = 16.2
Answer: 16.2