2 pts A mountaineer treks 4km North before turning around and hiking back
3km. What is the magnitude of the resultant vector of his travel?
O 7km
5km
O 1km
O 3km

Good moring let me you on this question the answer the electric force  have a good day ; )

Your answer is 120miles 

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.