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Aspecimen of charcoal found at stonehenge contains 63% as much carbon-14 as a sample of present-day charcoal. what is the age of the sample?
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Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.
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Sally deposited money into a savings account paying 4% simple interest per year. the first year, she earn $75 in interest. how much interest will she earn during the following year?
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