Exponential Functions help

Question

Radon-222 decays at a continuous rate of 17.3% per day. How much will 500 mg of Radon-222 decay to in 10 days?

 

So____?_____ mg of Radon-222 will remain. (Round answer to 5 decimal places)

Answer 1

I think there is a formula for this: A = A subscript 0 e^kt, where A = the amount left, and A sub zero = the original amount, and k = the negative decay rate in percent, and t = the number of units of time.

 

So, A = 500 e^-1.73 = 88.64