1. the person in charge of the overall creative vision or goal of the enesemble

the conductor

Explanation:

A music ensemble is led through a creative vision or goal by the music conductor. Generally there is only one conductor, however if there is more than one then all are led by the principal conductor.

coordinates of r(b,c)

slope of nm is 0.

step-by-step explanation:

the midpoint of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

the midpoint of the line segment nk is given by

∴r(b,c)

the slope of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

slope of rs is

hence

coordinates of r(b,c)

and slope of nm is 0.