The chemical element einsteinium-253 naturally loses its mass over time. When a sample of einsteinium-
253 was initially measured, it had a mass of 15 grams.
The relationship between the elapsed time t, in weeks, and the mass, Mweek (t), left in the sample is
modeled by the following function:
Mwock (t) = 15 - (0.79)
Complete the following sentence about the daily rate of change in the mass of the sample.
Round your answer to two decimal places.
Every day the mass of the sample decays by a factor of?