Consider matrices A and B:
Which matrix represents A − B?
These two matrices cannot be subtracted.

Answer this question, only if you know the answer. 30 points and brainliest!

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4