Caffenie leaces the body at a rate of 15.6% each hou. your first cup of coffee in the morning has 100 mg of caffenie
How long will it take before you have 50 mg of that caffenie in your body and how long will it take before you have 25 mg of caffenine in your body

- toxicsugar22

- katieb

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- anonymous

Y=-.156x + 100.
Put in each value for x and solve.

- anonymous

I'm sorry, not for x, for y and solve for x.

- anonymous

Y=-.156x + 100.
Put in each value for y and solve.

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## More answers

- toxicsugar22

k i got .00208 and .00312

- toxicsugar22

ia itright

- toxicsugar22

torch

- anonymous

Actually you have to use k=Ce^rt.
C=.5
K=50
r=-.156
Solve for t.

- toxicsugar22

ok so what doo i do first

- toxicsugar22

after plugiign in the number
s

- toxicsugar22

can u show me
please
so i will know

- toxicsugar22

can u show me
please
so i will know

- anonymous

K first divide by the constant. Then natural log both sides and divide by the other constant and you get the answer you had first.

- toxicsugar22

.0028 and .0032

- toxicsugar22

can u show me step by step so I know how to ddo it the next time

- anonymous

Alright do you have an answer key? Like what you're supposed to get?

- toxicsugar22

no where

- anonymous

Well you said the natural log answer a while ago

- anonymous

Oh jk that was a different one.

- toxicsugar22

yeah so can u please show me step by step on how to solve this problem

- toxicsugar22

please

- toxicsugar22

please

- anonymous

K hang on. I'll write it out for you but it'll take a bit. My iPad hates the typing in this.

- toxicsugar22

not to be rude but cn u hurry up
please

- anonymous

Alright, an easy way to think about it is to use a proportion.
-.156=x/amount of caffeine.
For example for the first one, you put in 100 and then you get 84.4. Basically you found the percentage of the amount of caffeine and subtracted it.
You do that 4 times to get to 50, so that's 4 hours.
Fir the second one, you do the same thing, and just keep going.
You get 8 hours.
Sorry it took so long, I was busy.

- anonymous

Good nuff?

- toxicsugar22

yes thank you

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