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Re: 28 robux if you help me?

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suprspi is not online. suprspi
Joined: 20 Oct 2014
Total Posts: 480
02 Nov 2014 11:12 PM
All I have.

PRECAL QUESTION:

The half-life of radioactive radium (226Ra) is 1620 years. What percent of a present amount of radioactive radium will remain after 100 years?

WHAT I HAVE DONE SO FAR
y = ce^kt

50 = 100e^k620

ln(1/2) = k1620
k = -0.000428

y = ce^-0.000428(t)

Answer in the end SHOULD BE 95.8%
but i have no idea how to get to it
:(
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suprspi is not online. suprspi
Joined: 20 Oct 2014
Total Posts: 480
02 Nov 2014 11:13 PM
B1
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suprspi is not online. suprspi
Joined: 20 Oct 2014
Total Posts: 480
02 Nov 2014 11:15 PM
B2
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suprspi is not online. suprspi
Joined: 20 Oct 2014
Total Posts: 480
02 Nov 2014 11:17 PM
B3
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suprspi is not online. suprspi
Joined: 20 Oct 2014
Total Posts: 480
02 Nov 2014 11:20 PM
ermg l2k why must roblox block ur replies
:(
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suprspi is not online. suprspi
Joined: 20 Oct 2014
Total Posts: 480
02 Nov 2014 11:22 PM
ROBLOX STAWP BLOCKING HIS POSTS DIS BOY NEEDS HELP
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Coffeeband84 is not online. Coffeeband84
Joined: 11 Sep 2012
Total Posts: 1038
02 Nov 2014 11:23 PM
wtf is this chemistry?
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suprspi is not online. suprspi
Joined: 20 Oct 2014
Total Posts: 480
02 Nov 2014 11:24 PM
no precal
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QuitBye is not online. QuitBye
Joined: 03 Apr 2008
Total Posts: 59703
02 Nov 2014 11:24 PM
IŽŽts nŽŽot aŽŽn eŽŽ^k oŽŽne
Its aŽŽ hŽŽalf lŽŽife, wŽŽhich wŽŽould nŽŽeed (ŽŽ0.5)^(t/1620)

So tŽŽhe sŽŽetup wŽŽould bŽŽe
y =ŽŽ sŽŽ(0.5)^(100/1620)

Because yŽŽou wŽŽere gŽŽiven tŽŽhe hŽŽalf lŽŽife, yŽŽou kŽŽnow iŽŽt'll dŽŽecrease bŽŽy eŽŽxactly 0ŽŽ.5 -ŽŽ- 0ŽŽ.5^1 -ŽŽ- iŽŽn tŽŽhe 1ŽŽ620th yŽŽear. TŽŽhat gŽŽives tŽŽhe 0ŽŽ.5^(t/1620).
Then yŽŽou're gŽŽiven aŽŽ tŽŽime oŽŽf 1ŽŽ00 yŽŽears. SŽŽo tŽŽ =ŽŽ 1ŽŽ00.

You tŽŽake tŽŽhe oŽŽriginal vŽŽalue -ŽŽ 1ŽŽ00% -ŽŽ aŽŽnd pŽŽlug tŽŽhat iŽŽnto tŽŽhe fŽŽormula fŽŽor tŽŽhe vŽŽalue aŽŽfter 1ŽŽ00 yŽŽears:

y =ŽŽ (ŽŽ100)(0.5)^(100/1620)
 ŽŽ =ŽŽ (ŽŽ100)(0.95811) (ŽŽapproximately)
 ŽŽ =ŽŽ 9ŽŽ5.811 (ŽŽapproximately)

So aŽŽpprox 9ŽŽ6% wŽŽill bŽŽe lŽŽeft aŽŽfter tŽŽhe 1ŽŽ00 yŽŽears

 WOOHOO. hŽŽttps://www.youtube.com/watch?v=cBVeNQ-mtcY‰‡
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Coffeeband84 is not online. Coffeeband84
Joined: 11 Sep 2012
Total Posts: 1038
02 Nov 2014 11:25 PM
I have percale and I'm at function right now xd
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QuitBye is not online. QuitBye
Joined: 03 Apr 2008
Total Posts: 59703
02 Nov 2014 11:25 PM
finally i break the noob!
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suprspi is not online. suprspi
Joined: 20 Oct 2014
Total Posts: 480
02 Nov 2014 11:27 PM
omg tyyyy l2k
make dat t-shirt pls
omg ty
I'm struggling so much in precal this year
skipped algebra 2 so I'm freaking out over this stuff
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QuitBye is not online. QuitBye
Joined: 03 Apr 2008
Total Posts: 59703
02 Nov 2014 11:41 PM
Javascript is crazy useful xd
Had to split everything with invisible characters!

But yeye
I loved my calc course lolol
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