Apendulum swings back and forth 5 times in 10 seconds what is the period of the pendulum?

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.

are there answer choices to this question? this seems like a question where you have options to choose from.