The elevation of city A is 72 feet above sea level; the elevation of city C is 24 feet above sea level. The elevation of city D is of the elevation of city C.
Part A: Write an expression to represent the elevation, in feet, of city D. (5 points)
Part B: Simplify the expression and explain why the answer is negative or positive. (5 points)
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"The elevation of city D is ?? of the elevation of city C."
