4. What were the earlier sources of the songs Charlie Patton, the Mississippi Sheiks, and others performed in and around Dockery Farms?

Explanation:

Dockery Farms began as a cotton plantation in the Mississippi Delta. ... unforgettable Delta bluesmen as Charley Patton, Robert Johnson, Son ... recorded using the name the "Mississippi Sheiks" at their musical jobs throughout the area

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.

variety in color and variety in texture