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Three groups of people are having separate conversations in a room. The sound of each conversation gas an intensity of 1.4 X 10^-5  watts per square meter. What is the decibel level of the combined...

A string of decorative lights is 28 feet long. The first light is 16 inches from the plug. If the lights on the string are spaced 4 inches apart, how many lights are there on the string.

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