Doug dives from a platform that is 10 meters above water. His dive takes him 3.8 meters below the surface of the water. How far does Doug's dive take him?
Doug's dive takes him meters.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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this is answer of 144 cubic meters

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