Use the graph to answer the question. Between which consecutive years was the increase in the price of oil per barrel greatest?
A. 2004–2005 B. 2009–2010 C. 2010–2011 D. 2007–2008
2 answers:
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Answer: Is true sometimes.
Step-by-step explanation:
I guess that here we have two matrices, A and B, that are nxn.
We can see that if those matrices can conmutate, then we can try it with some simple matrices.
Here, we would have that:
You can see that AB and BA are different, then the statement is not always true.
But it is true sometimes, if A or B are the identiti, then I*A = A*I, in this case would be true.
It is also true if A and B are diagonal matrices, let's prove it: