The exponential function P = 300 x 0.88m gives the amount in parts per million of PCBS in a contaminated site m months after a cleanup process begins. (a) What is the weekly decay factor? Assume there are four weeks in each month. (Round your answer to two decimal places.)

Suppose a radioactive substance decays at a continuous rate of 6% per year. How long will it be until only 30% of the original amount remains? Round your answer in years to the nearest hundredth (i.e., two decimal places). Enter number only, e.g. if your answer is 25.69 years, enter 25.69.

Use the exponential decay equation A = A0 · 0.5t/8, where A is the amount of a radioactive material present after time t, and A0 is the original amount of the radioactive substance. Round to the nearest tenth.Iodine-131 is an isotope that is used to study the functioning of the thyroid gland. A patient is given an injection that contains 8 micrograms of iodine-131. (a) What is the iodine level in the patient after 14 days?A = _____micrograms(b) How long (in days) will it take for the iodine level to reach 5 micrograms?t = _____days

A storage tank contains a liquid radioactive element with a half-life of 92 years. It will be relatively safe for the contents to leak from the tank when 0.02% of the radioactive element remains. How long must the tank remain intact for this storage procedure to be safe? CELEB The tank must remain intact for years. (Round the base of the exponential function to four decimal places. Then round the final answer to the nearest year as needed.)