The gravitational potential energy stored between an object and earth depends on
a. the object's height and weight
b. the object's mass and speed
c. the object's size and weight
d. the object's speed and height

Ibelieve the answer is d. bleachhope my answer has you : )

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

Shoot man tough luck