Chromium 51 is a radioactive substance used in medicine.
It has a 1/2 life of 28 days.
The equation for its exponential decay model is
28
y=a(.5)
If 10 mg is ingested by a patient, how many days
before only 8 mg is still emitting radiation?
Solve. 8 = 10(.5)
fort.
Use the base change formula to solve your logarithm.