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2 years ago

Simplify 4s + 5 – 3(6 + s) A) s - 13 B) 5s - 13 C) 3s + 18 D) 2s + 13

Mathematics

1 answer:

Anna11 [10]2 years ago

3 0

4s + 5 – 3(6 + s)

distribute

4s +5 -3*6 -3*s

4s +5 -18 -3s

s -13

ChoiceA

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Answer:

It would take 24 minutes for the element to decay to 50 grams

Step-by-step explanation:

The equation for the amount of the element present, after t minutes, is:

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In which Q(X) decays radioactively with a half life of 12 minutes.(0) is the initial amount and r is the rate it decreases.

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This means that $Q(12) = 0.5Q(0)$

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$r = 0.05776$

If there are 200 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 50 grams?

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$\ln{e^{-0.05776t}} = \ln{0.25}$

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