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Read this word problem.\newlineA dolphin was swimming 77 meters below the surface of the ocean. It located a squid and dove down 44 more meters to eat it. What is the location of the dolphin now relative to the surface?\newlineTo solve the problem, Lamar subtracted 7(4)-7 - (-4) and came up with an answer of 3-3 meters. Is Lamar correct? Why or why not?\newlineChoices:\newline(A) Yes, Lamar is correct.\newline(B) No. The answer should have been 1111 meters, not 3-3 meters, because the sum of the absolute values of the numbers is 1111.\newline(C) No. Lamar should have subtracted 74-7 - 4 because the dolphin started 77 meters below the surface and dove down 44 more meters.

Full solution

Q. Read this word problem.\newlineA dolphin was swimming 77 meters below the surface of the ocean. It located a squid and dove down 44 more meters to eat it. What is the location of the dolphin now relative to the surface?\newlineTo solve the problem, Lamar subtracted 7(4)-7 - (-4) and came up with an answer of 3-3 meters. Is Lamar correct? Why or why not?\newlineChoices:\newline(A) Yes, Lamar is correct.\newline(B) No. The answer should have been 1111 meters, not 3-3 meters, because the sum of the absolute values of the numbers is 1111.\newline(C) No. Lamar should have subtracted 74-7 - 4 because the dolphin started 77 meters below the surface and dove down 44 more meters.
  1. Start Depth: The dolphin starts 77 meters below the surface, so we start with 7-7 meters.
  2. Diving Down: Diving down 44 more meters means going 44 meters further below the surface, so we add 4-4 meters to 7-7 meters.
  3. Calculation: Calculating 7+(4)-7 + (-4) gives us 74=11-7 - 4 = -11 meters.
  4. Explanation: Lamar's calculation of 7(4)=3-7 - (-4) = -3 meters is incorrect because subtracting a negative is like adding a positive.

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