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Mathematics 7 Online
OpenStudy (sunshinehaggard):

Plutonium–238 has a yearly decay constant of 7.9 × 10-3. If an original sample has a mass of 15 grams, how long will it take to decay to 12 grams? (At = A0e-kt)

OpenStudy (sunshinehaggard):

i really need help on this

OpenStudy (wolf1728):

It seems that someone asked this exact same question two years ago: http://openstudy.com/study#/updates/518d0981e4b0cf6dd8f3e29f

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