An electric heater uses 9 per day at a cost of 0.4 AED per kWh . How much does it cost to run the electric heater for 5 days ?

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

i think the answer is a and b

i wish you luck

answerdmitry mendeleyev made a workable classification of the elements