Answer:
Approximately 9.211 times
Step-by-step explanation:
Given
--- half life of helium-5
--- half life of helium-9
Required
How many times greater is y than x
To do this, we simply divide y by x
Apply law of indices
What? Can you re-type this?
BC×AD=K
CKD= 180-32-79= 2x +180- 5x
-> x = (-32-79) : (-3) =37
c is the correct answer i believe