The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of 7% per day. A sample of this radioac substance has an initial mass of 4.65 kg. Find the mass of the sample after six days. Round your answer to two decimal places. Note: This is a continuous exponential decay model. And though the decay rate parameter is 7% per day, the actual decay is not 7% each day. [Bk-q x 53