The formation of a mirage is shown in the model here. To the observer, the image appears to be coming from the straight line, when in fact it is coming from an angled source. What BEST explains the observer and the mirage?

Work is reduced while time is decreased

How are period and frequency related to each other? dperiod is the reciprocal of frequency.

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.