Question

Suppose the population of trout in a certain stretch of a river is 4000. In about how many years will the population of trout be 700 if the decay rate is 35%? Use the equation 700 = (4000)(0.65)x and round the value of x to the nearest year.

Answer 1

4 years

Answer 2

how did you get that?

Answer 3

(4000)(0.65)^4

Answer 4

@arindameducationusc is that right? ^^^

Answer 5

okay @nabiladh thank you!

Answer 6

internets lagging so having a hard time seeing responses

Answer 7

no prob

Answer 8

actually its 1 year

700=4000(0.65)^x

7000/4000=4000/4000(0.65)^x

7/4=(0.65)^x

log(7/4)=log(0.65)^x

0.24=xlog(0.65)

x=0.24/(0.187)

x=1.28

x=1 year

Answer 9

stuck between the 2 idk good luck

Answer 10

@lily1021
i am pretty sure ..thatz not the answer.

Answer 11

hm okay so not 4

Answer 12

@zzr0ck3r can you help with this?

Answer 13

\(700 = (4000)(0.65)^x\\\dfrac{700}{4000}=0.65^x\\\ln(\dfrac{700}{4000})=\ln(0.65)^x=x\ln(0.65)\\
x=\dfrac{\ln(\dfrac{700}{4000})}{\ln(0.65)}\approx 4.04605\)


or


\(700 = (4000)(0.65)^x\\\dfrac{700}{4000}=0.65^x\\\log_{0.65}(\dfrac{700}{4000})=\log_{0.65}(0.65^x)=x\\x\approx 4.04605\)

Answer 14

so it is 4 years then

Answer 15

Are you asking me if the closest whole number to \(4.04605\) is \(4\)?

Answer 16

well I'm just confused now because it was 4 then it wasn't then it was 1 then I tried it on my own and got 3 somehow. It really was a rhetorical question.

Answer 17

you can check the answer by plugging it in...

Answer 18

its always been 4

Answer 19

But that was really unnecessary..

Answer 20

lol

Answer 21

It's not that funny. It was rude.

Answer 22

they are not mutually exclusive

Answer 23

It was meant to be funny. Sorry if you do not like my humor, focus on the math.

Answer 24

Meaning and intent aren't the same thing, so oop @ you. I'm not bothered though.

Answer 25

Meaning is actually synonymous to intent?

Answer 26

yes... @zzr0ck3r steps look good
yes thats a confirmation @lily1021

Answer 27

no need for confirmation. check your answers!

If I am right, then \(4000*0.65^{4.04605}=700\)

Get your calculators out!!!

Answer 28

LOL

Answer 29

yes, you are right @zzr0ck3r

Answer 30

Not really how something means to me isn't the same as how you meant something to be. English isn't my first language so maybe that's why you didn't understand.

Answer 31

Just leave my question, it's done with.

Answer 32

Please leave my question.

Answer 33

I fully understand that you are being a baby. Just say thanks for the help and move on :) It was funny. I know you were not asking me to round it for you, but I wanted to point out that it was a weird question. Also your reply about not being sure because it was 1, then it was 4... did you think I would say, oh actually yeah I am wrong and that other dude is right?

Answer 34

jokes again^^^

Answer 35

:D

Answer 36

k, guys i am going.... :)

Answer 37

No you are being rude. So stop. You seem to be the one who can't move on. Like why are you still here? This is my question I politely ask you go away.

Answer 38

I can not tell you anymore that I am joking. Also, the question is done. I solved it!!!

Answer 39

And I cannot tell you anymore it wasn't funny. So get off my question if the question is done!!

Answer 40

gn sorry :)

Answer 41

And I assure you many people would think it was funny.

Answer 42

Maybe pretentious douche bags who look down on people who are bad at math.

Answer 43

Please leave.

Answer 44

medal please?

Answer 45

lol

Answer 46

there ya go:)