Answer:
Rules for Reflections
Step-by-step explanation:
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Sheila is building an addition to a house. The points E(- 1 1/2, -2 1/2), F(4 1/2, -2 1/2), G(4 1/2, 3 1/2), and H (9-1 1/2, 3 1
1 answer:
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Answer:
464 grams.
Step-by-step explanation:
Amount of substance:
The amount of substance after t years is given by an equation in the following format:
In which A(0) is the initial amount and r is the decay rate, as a decimal.
Co-60 has a half life of 5.3 years.
This means that:
We use this to find r. So
So
If a pellet that has been in storage for 26.5 years contains 14.5g of Co-60, how much of this radioisotope was present when the pellet was put in storage?
We have that , and use this to find A(0). So
[tex]A(0) = 464[tex]
464 grams.