A sample of a radioactive isotope had an initial mass of 130 mg in the year 2010 and decays exponentially over time. A measurement in the year 2012 found that the sample's mass had decayed to 80 mg. What would be the expected mass of the sample in the year 2021, to the nearest whole number?

i only know the sequence of arithmetic it adds the first is 5+4 then it goes up as it adds to then it is 9+5 then 14+6 then to 20+7 and so on. 5,9,14,20,27,35.

step-by-step explanation:

answers

m = 0

n = 0.

explanation

most of the values are negative. the one that are not negative are the excluded   values.

these values are: m = 0

                              n = 0.