What the heck is even this, do you guys know the answer to this?

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 is 60.9643790503 to 5 decimal

The statement tan theta= -12/5, csc theta=-13/12, and the terminal point determained by theta is in quadrant two