What the roc for y=2x-5

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.)

The circumference of a circle is 5 pi cm. what is the area of the circle?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years