HELP ME PLZ WITH THIS (Physics)

100 pounds is 100 pounds no matter the object or item being weighed

The geological theory that states that pieces of earth's lithosphere are in constant slow motion is the theory of plate tectonics.

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.