Question

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

Answer 1

Y=-.156x + 100.

Put in each value for x and solve.

Answer 2

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

Answer 3

Y=-.156x + 100.

Put in each value for y and solve.

Answer 4

k i got .00208 and .00312

Answer 5

ia itright

Answer 6

torch

Answer 7

Actually you have to use k=Ce^rt.

C=.5
K=50
r=-.156

Solve for t.

Answer 8

ok so what doo i do first

Answer 9

after plugiign in the number
s

Answer 10

can u show me
please
so i will know

Answer 11

can u show me
please
so i will know

Answer 12

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.

Answer 13

.0028 and .0032

Answer 14

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

Answer 15

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

Answer 16

no where

Answer 17

Well you said the natural log answer a while ago

Answer 18

Oh jk that was a different one.

Answer 19

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

Answer 20

please

Answer 21

please

Answer 22

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

Answer 23

not to be rude but cn u hurry up
please

Answer 24

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.

Answer 25

Good nuff?

Answer 26

yes thank you