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The elevation of city A is 96 feet below sea level; the elevation of city C is 24 feet below sea level. The elevation of city D is 1 over 4 of the elevation of city C. Part A: Write an expression to represent the elevation, in feet, of city D. (5 points) Part B: Solve the expression and explain why the answer is negative or positive. (5 points)

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We shall use a negative sign for an elevation below sea level, and a positive sign for an elevation above sea level. Given: Elevation of city A = -96 ft (below sea level) Elevation of city C = -24 ft (below sea level) Let x =  elevation of city D. Part A. Because the elevation of city D is 1/4 of the elevation of city C, therefore x = (1/4)*(-24) Part B. Because 24/4 = 6, therefore x  = -6 ft. Answer: The elevation of city D is 6 feet below sea level. The answer is negative because the elevation is below sea level.

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