The half life of radon is 3.80days what would be its decay constant

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

What are the domain and range of the function f(x)=2^x+1

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.