Help plz !!! Which equation shows that the product of a square matrix A and its identity matrix / is A?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Find the smallest number by which the given number should be divided to make a perfect cube(with steps or the answer will get reported) a.108 b.2187

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.