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Forty grams of Iodine 131, a radioactive material, decays according to the equation A(t) = 40e^-0.087t (t is in days and A is the amount present at time t) 

 

a. How much iodine 131 is remaining after 5 days?

 

b. When will 10 grams of iodine 131 be left?

 

Thank you~~~

 Dec 18, 2020
 #1
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A  put 5 in for t   and compute   40 e (-.087)(5)  = .........  gms

B  put 10 in for A(t) and compute    10 = 40 e(-.087)(t)      and use your calculator to  solve for t

 Dec 18, 2020

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