Apparent brightness depends on which two properties?i’ll give brainlist?:)

Arise 8 run 1 this means go 8 up and 1 across, which is steepest

Independent variable is something that is changed in a experiment. 

From negative to negative

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