Answer:n=-2 or n=4
Step-by-step explanation:
Q is not inversible if det(Q)=0

Answer:
the first question id k
20. d
24. 105, 96, -20, -73, -560
last question i also dont know
Answer:
-12
Step-by-step explanation:
f(-3)= -(-3)2 + 6(-3)
= -(-6) -18
= 6 - 18
= - 12