Phosphorus-32 is a commonly used radioactive nuclide in biochemical research, particularly in the study of nucleic acids. The half-life of P-32 is 14.3 days. What
mass of P-32 is left from an original sample of 175 mg after 43.5 days?

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.

yes the answer is total mass in unchanged   : )