The diagram shows waves of sound travelling through the air. An illustration of a point labeled sound source with concentric circles spreading out from it. Every other circle is 1 more meter away from the source. The sound source is 270 decibels. By which factor is the sound intensity decreased at 3 meters? StartFraction 1 over 9 EndFraction. StartFraction 1 over 3 EndFraction. StartFraction 1 over 2 EndFraction. StartFraction 1 over 4 EndFraction.

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.

newton's first law of motion

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle