A sample of a radioactive isotope had an initial mass of 240 mg in the year 1995 and decays exponentially over time. A measurement in the year 2000 found that the
sample's mass had decayed to 80 mg. What would be the expected mass of the
sample in the year 2006, to the nearest whole number?

123

step-by-step explanation:

agngel

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.