Bismuth-214 has a half-life (50%) of approximately 20 minutes. Find the amount of Bismuth-214 left from a 40-gram sample after 2 hours.

3.36

Step-by-step explanation:

f(x)=214(1-.50)^6                       6= amount of times 20 min goes into 2 hrs

f(x)=214(.50)^6

.5^6=.0157

f(x)=214(.0157)

       3.36

you first to choose the points and then move from then as the slope you have