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strojnjashka [21]
3 years ago
13

Bismuth-214 has a half-life (50%) of approximately 20 minutes. Find the amount of Bismuth-214 left

Mathematics
2 answers:
ivolga24 [154]3 years ago
8 0
La verdad no se la respuesta perdón
Greeley [361]3 years ago
3 0

Answer: 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

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Answer:

There are 6 dimes and 9 quarters.

Step-by-step explanation:

Represent the number of dimes and the number of quarters by d and q.

Then d + q = 15, or q = 15 - d.

Also, ($0.25)q + ($0.10)d = $2.85, or 5q + 2d = 57.

Substituding 15 - d for q, we get 5(15 - d) + 2d = 57, or

75 - 5d + 2d = 57, or

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3d = 18.  Thus, there are 6 dimes.  Since q = 15 - d, q = 15 - 6 = 9.

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