The intensity of sound is measured on the decibel scale, dB. The equation dB=10log I represents the decibel level, where I is the ratio of the sound to the human hearing threshold. A noise registers a decibel level of 29. Which equation could be used to find how many times greater the noise is than the human hearing threshold.

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.

Binary fission and mitosis