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An art dealer bought some paintings for $360. When a storm ruined 2 of them, he sold the rest for $380, thus making a profit of $8 on the original cost of each painting. How many pictures did he buy...

During a storm, the high tide and low tides of a beach were recorded. Let t be the number of minutes since noon. Suppose the high tide was 52 feet above the shoreline and occurred at t=6 minutes....

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