What is the efficiency of a heat engine that produces 4, 200 J of work when 8,950 J are input? Would this machine be considered efficient?

Independent variable is something that is changed in a experiment. 

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached

It would be c hope this out