SOLUTION: If k = 0.211, how long will it take a battery to reach a 84 % charge?

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Question 924546: If k = 0.211, how long will it take a battery to reach a 84 % charge?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
In what way? Exponential Decay? What time units give k=0.211 ?

Are you using y=p%2Ae%5E%28kt%29 ?