Math algebra and exponents

Question

Radon-222 decays at a continuous rate of 17.3% per day. How much will 130 mg of Radon-222 decay to in 6 days?

Answer 1

A = Pe^.173t where P= initial amount, t = number of days, A = Amount after t days

A 130e^-.173(6)

A = 109.35 mg after 6 days