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LuckyWell [14K]
1 year ago
14

The half-life of lead is 18 years. How long will it take for the sample of this substance to decay to 15%?a. Find your k

Mathematics
1 answer:
ipn [44]1 year ago
7 0

Solution

We are given

Half Life = 18 years

To solve for k

\begin{gathered} 0.5=e^{-18k} \\ ln(0.5)=-18k \\ k=-\frac{ln(0.5)}{18} \\ k=0.0385081767 \end{gathered}

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A group of friends wants to go to the amusement park. They have no more than $320 to spend on parking and admission. Parking is
Hunter-Best [27]

A group of friends wants to go to the amusement park. They have no more than $320 to spend on parking and admission. Parking is $9.25, and tickets cost $28.25 per person, including tax. Write and solve an inequality which can be used to determine p, the number of people who can go to the amusement park.​

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Please, give me some minutes to take over your question

________________________

They have no more than $320 to spend on parking and admission

320 ≥ 9.25 + 28.25*p

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__________________________

Answer

The number of people who can go to the amusement park can be a maximum of 11 people (less than or equal to 11).

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