A sample of polonium-210 has an initial mass of 3200 milligrams (mg). If the half-life of polonium-210 is 14 days, how many mg of the sample remains after 70 days? PLS HELP I WILL MARK BRAINLIEST TO THE FIRST ANSWER

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering