Given Half Life Substance Find Time for Exponential Decay Application

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You're a life saver man - thank you!

steveb
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Best explanation I have found so far - thank you!

Munkyluvva
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Thank you so much, you are saving my ass on my next math quiz

bear
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Hello, your explanation is so clear. It's my first time to do that and i get so well, but i have a question for my exercice the time is given in hours and the half time is 5 hours for 120 mg and i have to find how long will it take for substance to decay 20 mg. I follow that methods but i find 13 hours, but i don't think that right because if the half time is 5 hours how that can be double, yet the substance it isn't finish yet?

sarahsheckinaezememve