How much does it cost to use an electric blanket for 8 hours per night for 150 nights, that plugs into a 120 volt receptacle if it has a resistance of 10 ohms if electricity is $0.08/kWh?

Answerboth technicians (a) and (b);

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.