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Citrus2011 [14]

3 years ago

9

Billy receives $15 every month for allowance. He puts $3 of his allowance into a piggy bank until his piggy bank has $119. How m

any months has he been saving part of his allowance

1 answer:

Leni [432]3 years ago

5 0

Answer:

39.6666667

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

$-\dfrac{\text{d}L}{\text{d}t} = kL\\\\\dfrac{dL}{L}=-kdt\\\\\ln L = -kt + C\\\text{At t = 0, L = L$_{0}$, so C = $\ln L_{0}$}\\\ln L = -kt + \ln L_{0}\\\ln L_{0} - \ln L = kt\\\\\ln \dfrac{L_{0}}{L} =kt$

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Calculation:

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