The student set up the polometer under Ihree diarent
conditions
A no wind at 15 °C
B no wind at 25 °C
C wind at 25
°C
For each investigation the
student measured how far the
air
bubble moved along the scale
in 2 minutes.
Name the two independent
variables the student
investigated.
Name two variables that the
student controlled

The answer to the question is d

It idk haha what are we doing?

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.