题目内容
During the lecture, Dr. Harpp demonstrated the formula for calculating how long it takes for bone mass to "halve". In his example, it would take 10 years given a rate of decrease of 7% per year for the bone mass to be "halved".Suppose through the use of calcium supplements and increased physical activity the rate of bone loss was reduced to 4% per year. Recalculate the number of years to it will take to halve the bone mass.(Round your answer to one decimal place) ______
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