Eva sees a dolphin 3.23.23, point, 2 meters below sea level and a bird \dfrac{47}{10} 10 47 start fraction, 47, divided by, 10, end fraction meters above sea level. Which of the expression represents the vertical distance between the dolphin and the bird?

This question is not that clear, so let me rewrite it here -

Eva sees a dolphin 3.2 meters below sea level and a bird meters above sea level. Which of the expressions represents the vertical distance between the dolphin and the bird?

Now we are given that Eva sees the dolphin at a distance 3.2 meters below sea level, respectively she sees a bird at meters above sea level. The vertical distance between the dolphin and the bird should thus be the distance dolphin is below sea level + distance of bird above sea level -

The expression that represents the vertical distance between the dolphin and bird should be 3.2 + 47 / 10.

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