I got the answer 5.7, but the computer marked it incorrect. What did I do wrong? What's the right answer?

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:

i'm pretty sure it is letter c.) car

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.