Question 1161522
.


The post by @MathLover1 consists of two statements and a conclusion.


Of these two statements, the first one is correct, but the second contradicts to the first one and is <U>INCORRECT</U>.


Her conclusion is INCORRECT, too.


The correct solution to the problem is below.


<pre>
    I used the text by @MathLover1, by re-edited it to make it correct.
</pre>


<U>Solution</U>


You can only multiply two matrices if their dimensions are compatible , which means the number of columns 
in the first matrix is the same as the number of rows in the second matrix.


Matrix C has the dimensions 7 X 2 (two columns) and Matrix D has the dimensions 2 X 7 (two rows).


So, their dimensions are  compatible for multiplication in this order.


Therefore, the <U>ANSWER</U> is:


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C. &nbsp;&nbsp;Matrix &nbsp;CD &nbsp;has the dimensions 7 X 7.


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Solved.