This type of posture occurs when you are performing work that causes you to hold the same posture or postition for an extended amount of time working in such positions can restrict your blood flow and damage your muscles

Answer(b) both involve the use of levers;

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.

Iwould say the answer is b.  christians believed jesus was the messiah, or savior of man.  because most jews do not believe  in jesus