Question

Sodium-24 has an hourly decay rate of about 5%. How many grams of a 900 g sample will remain after 90 hours? Round the answer to two decimal places.
7.03 g
7.50 g
8.90 g
28.13 g

Answer 1

$\bf \qquad \textit{Amount for Exponential change}\\\\ A=P(1\pm r)^t\qquad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{starting amount}\to &900\\ r=rate\to 5\%\to \frac{5}{100}\to &0.05\\ t=\textit{elapsed period}\to &90\\ \end{cases} \\\\\\ A=900(1-0.05)^{90}$

Answer 2

Answer:

The answer is 8.90g If this helped you in any way pls mark this answer as brainliest pls.

Step-by-step explanation: