2 years ago

Cool Tees buys a shirt for $21. The sale price is120% of the original price. What is the sale price for this shirt?

Mathematics

1 answer:

GarryVolchara [31]2 years ago

8 0

Answer:

divide 21 by 12 then multiply by 10 = $17.5

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226Ra has a half-life of 1599 years. How much is left after 1000 years if the initial amount was 10 g?

Ray Of Light [21]

$\bf \textit{Amount for Exponential Decay using Half-Life}\\\\
A=P\left( \frac{1}{2} \right)^{\frac{t}{h}}\qquad 
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{initial amount}\to &10\\
t=\textit{elapsed time}\to &1000\\
h=\textit{half-life}\to &1599
\end{cases}
\\\\\\
A=10\left( \frac{1}{2} \right)^{\frac{1000}{1599}}$