Answer :
Final answer:
In order to determine how much more Callie needs to descend to reach sea level again, subtract the 175 ft she has already descended from the 500 ft she initially ascended. The result, 325 ft, is the elevation change she still needs to complete.
Explanation:
This problem is a simple subtraction problem. Callie starts at sea level and then hiked up to 500 ft. She then descended 175 ft. Therefore, to calculate how much more she needs to descend to reach sea level again we need to subtract the 175 ft she already descended from the 500 ft she initially ascended.
So, the calculation is 500 - 175 = 325. Therefore, the integer that represents the change in elevation she still needs to complete in order to reach sea level again is 325 ft.
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