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okay so basically

we keep losing 1/2 ever 30 seconds

i found the 'r' by doing ln2/30

wait i have to figure it out too

|dw:1443224796743:dw|

|dw:1443224894019:dw|

then we multiply 30*n to see how many seconds

im confused

okay let me see how to explain this

oohhh wait wait i think i know what you mean

you start with 1 mg

i mean, 1 "sample" of it, right?

yep

okay, and howd you get the (1/2)?

Okay

basically like this, now you know that for every half life we multiply by a 1/2

okay

|dw:1443225179484:dw|

okay that makes sense

so how would we incorporate that into the formula?

|dw:1443225321392:dw|

okay

|dw:1443225534573:dw|

every 30 secs u want a new half lige so

life

okay

|dw:1443225561434:dw|

i believe this works

let me thing hmm

think

here is an example layout, but doesnr have answers, it confused me

i dont know if that helps any

gimme a few mins, i am dealing with someone here

okay

yeah dont worry ill help u understand this stuff its pretty simple

okay thanks!

actually i think i figured it out!

waiitt okay

i want to show u something important first

are you there

crap, nvm i got it wrong

okay remember the (1/2)^n formula

yeah

now lets tweak that a little bit okay we know that for evert 30 secs we want it to be halved so

1*(1/2)^(t/30)

now u see every 30 secs we would exactly half it

the equation they give u is this just in disguise

that makes sense

like for example

if we apply e^ln(x) = x
e and ln cancel out right

lets apply to that equation we know has to be right

okay

e^ln((1/2)^(t/30))

do you know your ln rules like
ln(x^3)= 3 ln x the power multiples

oh wait, dont you bring it to the rfont of the ln?

front *

|dw:1443226339275:dw|

with a little bit of manipulation we see that the equation is exactly reuivalent

equivalent

there is only 1 rule im applying here over and over

|dw:1443226451939:dw|

yes i do remember those

okay go ahead fill it all in now

|dw:1443226609625:dw|

yes that is correct

http://prntscr.com/8kirao

i got 79.33, is that right?

seconds

i am not using a calculator make sure u round it to the 10th

its correct :) thank you again so much, youre awesome!

okay you're welcome :)