How long does it take the projectile to reach its highest point in its trajectory?

It takes about 88 seconds for the cannonball to reach its maximum height (ignoring air resistance).

Explanation:

a.) is the correct answer.

explanation:

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.