Which of these is the algebraic expression for "6 less than 5 times some number?" 6n − 5 5n − 6 5 − 6n 6 − 5n

Mathematics

2 answers:

11Alexandr11 [23.1K]3 years ago

5 0

6 less than (-6) 5 times some number (5 times n)

-6+5n or 5n-6

2nd one

NISA [10]3 years ago

4 0

"B"

Step-by-step explanation:

6 less than (-6) 5 times some number (5 times n)

-6+5n or 5n-6

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A particular isotope has a half-life of 74 days. If you start with 1 kilogram of this isotope, how much will remain after 150

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$\bf \stackrel{150~days}{\textit{Amount for Exponential Decay using Half-Life}} \\\\ A=P\left( \frac{1}{2} \right)^{\frac{t}{h}}\qquad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{initial amount}\dotfill &1\\ t=\textit{elapsed time}\dotfill &150\\ h=\textit{half-life}\dotfill &74 \end{cases} \\\\\\ A=1\left( \frac{1}{2} \right)^{\frac{150}{74}}\implies A=1\left( \frac{1}{2} \right)^{\frac{75}{37}}\implies \boxed{A\approx 0.24536}$

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Jenna is correct. This is because the square root of 2 is an irrational number. And if the number is a prime number, the answer is less likely to have a rational square root.

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