The height of a cylindrical building is 21 m. if the radius of the floor is 10 m, find the volume of the building to the nearest tenth of a meter.

a.) 6,594 cubic meters

b.) 659.4 cubic meters

c.) 13,847.4 cubic meters

d.) 210 cubic meters

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.)

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?