High School

On a certain day in Singapore, the high tide was 2.8m above the water mark on the sea wall. The low tide was 1.5m below the mark on the sea wall.

Find the difference between the high and the low tides.

Answer :

To find the difference between the high tide and the low tide, we need to calculate how much higher the high tide is above the low tide.

  1. High Tide: The high tide is 2.8 meters above the water mark on the sea wall.

  2. Low Tide: The low tide is 1.5 meters below the water mark on the sea wall. This value is negative because it's below the reference point.

  3. Calculation:

    • When calculating the difference in this context, we have to consider both directions (above and below).

    • The difference between the high tide at 2.8 meters above and the low tide at 1.5 meters below is calculated as follows:

      [tex]\text{Difference} = 2.8 - (-1.5)[/tex]

    • Simplifying this expression, we get:

      [tex]\text{Difference} = 2.8 + 1.5 = 4.3 \, \text{meters}[/tex]

Therefore, the difference between the high tide and the low tide is 4.3 meters.

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