Technetium-99m, a radioisotope used to image the skeleton and the heart muscle, has a half-life of about 6 hours. find the decay constant. use the decay function n(t)=n0e−kt to determine the amount of a 250 mg dose that remains after 24 hours. 16 mg  or 63 mg or 125 mg or 3998 mg plz show how to solve the equations

Television viewing reached a new high when the global information and measurement company reported a mean daily viewing time of 8.35 hours per household. use a normal probability distribution with a standard deviation of 2.5 hours to answer the following questions about daily television viewing per household. a. what is the probability that a household views television between 4 and 10 hours a day? (to 4 decimals) b. how many hours of television viewing must a household have in order to be in the top 7% of all television viewing household? (to 2 decimals) c. what is the probability that a household views television more than 4 hours a day? (to 4 decimals)