What is a vector quantity? a. a quantity direction only b. a quantity with magnitude and direction c. a quantity with magnitude only d. a quantity with no magnitude and no direction?

A vector is a quantity with magnitude (size) and direction. (B)

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.