What does this mean?? Urgent!

Will mark brainliest. when ∆rst is translated 4 units down, what are the apparent coordinates of t’?

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 the slope of the line that contains the points (-2,1) and (0,-3)