The father's position relative to the surface of the water is 4.2 meters below the surface of the water.
What is an expression?
Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.
The height relative to the water surface is calculated as:-
Height from iceberg to water surface = 0.5 meters
The height from iceberg to deep inside the water is = 4.7 meters
Father's height relative to the water surface is,
H= 4.7 - 0.5 = 4.2 meters.
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