The hall-life for the radioactive decay of Ce-141 is 32.5 days. If a sample has an activity of 3.9 uCi after 195 d have elapsed, what was the initial activity, in microcuries, of the sample?
Express your answer using two significant figures.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

answerto predict;