To find the diver's elevation when he is 2/3 of the way down to the treasure that is 97.2 feet below the surface, you can calculate it as follows:
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First, find how far down the diver is at 2/3 of the total depth: \[ \text{Depth} = 97.2 \text{ feet} \times \frac{2}{3} \]
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Calculate the value: \[ 97.2 \times \frac{2}{3} = 64.8 \text{ feet} \]
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Since the depth is below the surface, the elevation is negative: \[ -64.8 \text{ feet} \]
Therefore, the diver's elevation when he is 2/3 of the way down is \(-64.8\) feet.