exponential functions college algebra

Mathematics
Tutor: None Selected Time limit: 1 Day

The half-life of radium is 1600 years. If the initial amount is 

q0 milligrams,
 then the quantity 
q(t)
 remaining after t years is given by 
q(t) = q02kt.
 Find k.
Apr 9th, 2015

From the formula q(t) = q0 2kt and the definition of half-life T, q0/2 = q02kT . Then 2kT = ½ = 2–1 and kT = –1. Finally, k = –1/T = –1/1600 = –6.25×10–4 .


Apr 9th, 2015

Thank you so much!!

Apr 9th, 2015

You are welcome!

Apr 9th, 2015

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