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2 years ago

18. The half-life of a radioactive isotope is 7 years.

Mathematics

2 answers:

lutik1710 [3]2 years ago

6 0

Answer:

100(0.5)^X/7

Step-by-step explanation:

That is how you would put it ;)

maxonik [38]2 years ago

4 0

Answer:

i’m not sure

Step-by-step explanation:

i’m not sure

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2 years ago

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Answer:

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Step-by-step explanation:

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2 years ago

The endpoints of a regular pentagon are (-1,4) and (2,3). What is the perimeter of the Pentagon?

ryzh [129]

the assumption being that the endpoints are two continuous points in the pentagon, Check picture below.

$\bf ~~~~~~~~~~~~\textit{distance between 2 points} \\\\ (\stackrel{x_1}{-1}~,~\stackrel{y_1}{4})\qquad (\stackrel{x_2}{2}~,~\stackrel{y_2}{3})\qquad \qquad d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\\\ d=\sqrt{[2-(-1)]^2+[3-4]^2}\implies d=\sqrt{(2+1)^2+(3-4)^2} \\\\\\ d=\sqrt{9+1}\implies d=\sqrt{10}~\hfill \stackrel{\stackrel{~\hfill \stackrel{\textit{5 sides}}{}}{\textit{perimeter of the pentagon}}}{5\sqrt{10}}$

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