Iodine-123 has a half-life of about 13 hours, emits gamma-radiation, and is readily absorbed by the thyroid.
because of these facts, it is regularly used in nuclear imaging.
a. write a formula that gives you the percent pp of iodine-123 left after t half-lives.
b. what is the decay rate per hour of iodine-123? approximate to the nearest millionth.
c. use your result to part (b). how many hours h would it take for you to have less than 1% of an initial dose of
iodine-123 in your system? round your answer to the nearest tenth of an hour.

(01.03 mc) which of the following is a step in simplifying the expression x multiplied by y to the power of 2 over x to the power of negative 3 multiplied by y to the power of 3, the whole to the power of negative 4. select one: a. x to the power of negative 4 multiplied by y to the power of negative 2, the whole over x to the power of negative 7 multiplied by y to the power of negative 1. b. x to the power of negative 4 multiplied by y to the power of negative 8, the whole over x to the power of 12 multiplied by y to the power of negative 12. c. x to the power of negative 4 multiplied by y to the power of negative 8, the whole over x to the power of negative 3 multiplied by y to the power of 3. d. x to the power of negative 4 multiplied by y to the power of negative 2, the whole over x to the power of negative 3 multiplied by y to the power of 3.