Strontium 90, a radioactive isotope of strontium, is present in the fallout resulting from nuclear explosions. It is especially hazardous to animal life, including humans, because, upon ingestion of contaminated food, it is absorbed into the bone structure. Its half-life is 27 years. If the amount of strontium 90 in a certain area is found to be eight times the "safe" level, find how much time must elapse before an "acceptable level" is reached.
?
__________ years
Fill in the blank(s) with the appropriate word(s).
81
Mathematics
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A. 600 years B. 309 years C. 300 years D. 256 years
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%Time in years = 3
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What will be an ideal response?
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Find the variance of the probability density function to the nearest hundredth.f(x) = 
; [3, 5]
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