Question

Doctors can use radioactive chemicals to treat some forms of cancer. The half life of a certain chemical is 7 days. A patient receives a treatment of 20 millicuries of the chemical.​ (A millicurie is a unit of ​ radioactivity.) How much of the chemical remains in the patient 14 days​ later? The amount remaining after 14 days is ____ millicuries.

Answer 1

Answer:

5 millicuries

Step-by-step explanation:

Half life is 7 days which means it will be at 10 millicuries if we half that again for another 7 days then it will be 5.