To find the magnitude of the distance between the lowest point in the United States (Death Valley, at -282 feet) and the highest point (Denali, at 20,310 feet), we can calculate the total distance between these two elevations.
First, we consider the elevation of Death Valley as -282 feet (below sea level) and Denali's elevation as +20,310 feet (above sea level). The total change in elevation between these two points can be calculated using the formula for distance:
\[ \text{Distance} = \text{Elevation of Denali} - \text{Elevation of Death Valley} \]
Substituting the values:
\[ \text{Distance} = 20,310 - (-282) \]
This simplifies to:
\[ \text{Distance} = 20,310 + 282 = 20,592 \]
Thus, the magnitude of the distance between the two points is:
\[ \boxed{20592} \text{ feet} \]
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