On a distance-time graph indicates the speed.

a. the y-axis

b. the slope

c. the x-axis

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

it is the most commonly accepted one

idk i'm not smart

explanation:

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