A kayaker moves 18 meters southward, then 32 meters northward, and finally 24 meters southward.

what was the distance it moved

what is the magnitude and direction of the displacement

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.

found in the nucleus

has mass of one amu