Explain why the entering liquid pressure has no effect on the opening force of a balanced Port TXV

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;

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.