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I have been abandoned to the wolves by a math prof who has given us far too little information in this online class with an online text book to find my way to understand any of these things. You are a saint and I can't tell you how much I appreciate this.
MR. Organic Chemistry Tutor, thank you for a solid explanation of Exponential Growth and Decay Word Problems in Precalculus. These are real world problems that has a direct impact on everyday life.
Here I am at 1am doing math, hell yeah 08/04/23 it has been 2 years, I am currently in university revisiting this video at 2AM. I haven't changed in the fucking slightest
For the last question you could just simply take log3 of 5x10 to the power of 6 then you would get 14,04 then you need to divide it by 4 in order to take it from 1 hour to 15 min, just a short way...
What if we are not given a rate? e.g.: The number of bacteria in a culture decreases according to a continuous exponential decay model. The initial population in a study is 320 bacteria, and there are 240 bacteria left after 7 minutes.
Lucian Galev That means you would have to do 240=320(1-r)^7 and then get r by itself to find the rate. The next steps are pretty straight forward from there. I know I’m late but I’m just saying 😬
ur video is very helpful,thank you for that.Also I dint get the part in the third example about the future and present and then the past was present and the future te past.....just asking the questions for other viewers like me I hope I'm not the only one LOL
you can also put a as the present value for 225000. and u can do the time 13 months as negative to show going back 13 months in the past. u will get the exact same value.
Sorry. I am a little confused. I thought exponential growth and decay of a population is when we apply the formula of A(t) = A* e^kt. Why we can't apply this formula. What is the difference?. And I think this is most for Compound interest. Thank you
can you help me answer these? At the beginning of the year, a wildlife area that is 1,000,000 ha in size has a population of 90 Brown bears with a per capita growth rate of 0.02. It's estimated that brown bears need a territory of about 10 km2 per individual (note: 1 km2 = 100 ha). Use this information to answer the following questions. a. What is the density of brown bears in this wildlife preserve currently? b. What is the carrying capacity of the preserve? c. What is the population growth rate for this year?
Excellent video!! thanks so much! :) I just have one question, how do you enter the division for the last problem, log[5x10^6]/4log3 in a TI-84 Plus Calculator?...
for the problem where you are given the house value in 2015 and you are trying yo find the value in 2002, instead of doing all this work, you can just make the exponent -13, which is basically the number of years you have to go back
This is funny because im actually watching in 2020 but in a couple hours its gonna be 2021 so i found this video just before it was too late - Dec. 31, 2020
Tomorrow is my final exams for the first semester! If I passed it, I’ll thank you so much! Edit: Honestly, I didn’t understand this but with this vid, it seemed easy on ya boi.
Back in the 1960s, the group Spiral Staircase performed a song called "I Love You More Today than Yesterday", which includes the lyrics, "I love you more today than yesterday, but only half as much as tomorrow." Suppose the group first sang that song on (say) January 1, 1969. By how much would the singer's love have increased at the end of one year (January 1, 1970)? Please write your answer as an exponential expression with a base of 2 (i.e. write it as "2"x") if you know ans text me sir please
I’m confused don’t you do the exponent first? Like before u multiply so wouldn’t you do the (1.08)^15 and then multiply that by 1000? Can someone explain
I know you asked this a long time ago but it might help someone else... Either method is valid but to use your suggested equation you must first calculate the value of k. The method used here is quicker.
Our teacher told us to use a(t)=a*e^rt And your equation is y=a(b)^x What's the difference? I solved for the first problem using my teacher's method and got a completely different answer
can you re teach the bacteria one, what do you mean by you can use minutes? Also what if the minutes is more than 60 mins how can you convert it to Hours then?
Let’s say your equation is y = 25(.85)^t The question I need help with is “How much medicine is leaving the body each hour?” Would the answer be 15% or 85%? Because you get the .85 in the equation you’d have to do 1-0.15. I’m confused??
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Final Exams and Video Playlists: www.video-tutor.net/
Full-Length Videos & Worksheets: www.patreon.com/MathScienceTutor/collections
Next Video: th-cam.com/video/F1b1beR3sNk/w-d-xo.html
I have been abandoned to the wolves by a math prof who has given us far too little information in this online class with an online text book to find my way to understand any of these things. You are a saint and I can't tell you how much I appreciate this.
Same situation i'm currently in ..... SMH
Same situation here!
ah yes, It seems every year we got prof who just does this from across the country and world... -_-
I love how you start with simpler problems and slowly move towards the harder ones and your sooo cleearrr. Tysm!
I love how I get all these adds about not doing exactly what I'm doing
Dave Han same its a break
Did you understand yourself before we can understand what you saying lmao
Your first bacteria example was extremely helpful. Thank you so much.
Thanks
Do we need to represent b=1+r?
@@hendryxcapino3998 only if it is an exponential growth, if it is a decay we can just subtract by 1 instead. (1 - r)
@@TheOrganicChemistryTutor hi
The last one give me migraine bc I don’t know where to get 10^6 / My thoughts, 500m divided by 8100 = exponent
Who's here the day before their exam?
yessir
My test is next hour my dude. Pray for me cuz I need it. Bless
My test is today
ᕼᗩᗰᘔ how did it go?
Exactly 😂
There's officially 3172 rabbits here the day before their exam.
Jesse Milewitz and this ones crying over fricken math
😂
Thank you so much!!!! I’m stuck in quartine without a tutor! I’ve tried khan academy and it was so confusing! You’ve made it look so easy ❤️❤️
i started with that but i dont go near it anymore for the same reason,it confuses me alot.
I came here because I spent almost all day trying to understand exponential growth from khan academy as well
MR. Organic Chemistry Tutor, thank you for a solid explanation of Exponential Growth and Decay Word Problems in Precalculus. These are real world problems that has a direct impact on everyday life.
Thank you so much for this tutorial!!! I really helped me prepare for the PSAT!!!
Your formulas are so much more simple than the (1+r/n)^nt I'm being asked to do in my class.
Here I am at 1am doing math, hell yeah
08/04/23 it has been 2 years, I am currently in university revisiting this video at 2AM. I haven't changed in the fucking slightest
Samee
Same bro
Sammmmmmme
Same
already know bro
Thank you so much, Im super tired and Now I can finally go sleep haha
IKR I’ve been studying all day for a test
I love this feeling
Me too
Had no idea how to calculate exponential decay and my math textbook didn't explain it either despite having one in its assignments! Thank you so much!
Love your videos! Honestly you've been teaching it better than my teacher! Thank you! 🙏
Problem at 3:45 was so helpful! Thank you so much man
My glorious king Organic Chemistry Tutor
THANK YOU SO MUCH I WAS STUCK ON A MATH ASSIGNMENT FOR 3 HOURS CAUSE I COULDN'T FIGURE THIS OUT!!!
Being in 2020 now I can confirm there are 3172 rabbits on that island I counted them myself
For the last question you could just simply take log3 of 5x10 to the power of 6 then you would get 14,04 then you need to divide it by 4 in order to take it from 1 hour to 15 min, just a short way...
Last year of high school is killin me
But this is making it 10x easier
THANK YOU
What if we are not given a rate?
e.g.: The number of bacteria in a culture decreases according to a continuous exponential decay model. The initial population in a study is 320 bacteria, and there are 240 bacteria left after 7 minutes.
The Question was how many are there 18 minutes after?
then the rate is just 1
Lucian Galev
That means you would have to do 240=320(1-r)^7 and then get r by itself to find the rate. The next steps are pretty straight forward from there. I know I’m late but I’m just saying 😬
Ryan Chandra
You can’t assume the rate because then it won’t give you 240 bacteria leftover.
@@dummy8306 thanks
Thanks man! I was tired and stuck on this.
Ad: Are videos from 2016 really helping
Me: watching this video saying yes proudly (skips ad)
My math teacher just talks about big foot so I just stopped going and now use u as my math teacher thank you
Wow
😂
thank you sooo much it helped me a lot with my calculus course
This is EXTREMELY helpful. Thank you so much
Thanks alot my daughter is passing because of your videos. 2024
2021 and still so helpful !! by the way my exam is tomorrow :D
Aint no way 9:08 was the exact question on my test, im so glad i watched this video
I know, right ✅️
This is getting me through the quarantine
Watching this instead of my algebra teachers lesson which is 60 minutes long and wasted my time
In 2024, I can indeed guarantee that this exact car costs $20,816.44
Indeed
This video it's really helpful for SAT
Here I am learning this 20 minutes before the STAAR test begins
I remember doing the staar test...then u moved and I'm doing final exams R.I.P
how well did you do?
ur video is very helpful,thank you for that.Also I dint get the part in the third example about the future and present and then the past was present and the future te past.....just asking the questions for other viewers like me I hope I'm not the only one LOL
Bro is actually Abt to save me from the interim
THIS HELPED SO MUCH THANK YOU
Ty for this tutorial Organic Chem.
you can also put a as the present value for 225000. and u can do the time 13 months as negative to show going back 13 months in the past. u will get the exact same value.
Thanks for getting me an A on my quiz in algebra 2
Sorry. I am a little confused. I thought exponential growth and decay of a population is when we apply the formula of A(t) = A* e^kt. Why we can't apply this formula. What is the difference?. And I think this is most for Compound interest. Thank you
Thats what Im talking about, thats why hes the MVP, thats why hes the GOAT THE GOAT
Thank you so Much dude! you're a life saver.
thank you very much. the problems are very well explained, and helped me relearn the subject quickly
THANKS MAN THIS IS A GREAT HELP
Thanks ,you are better than 👉other tutors 👍🤘
I love this guy so much.
i like how when i went to this video for my online algebra class, there was an ad saying "What? still looking at youtube for math help?"
So basically decay is exponential decrease right?
Growth increases - Decay decreases, but this won't benefit you anymore lol been 10 months
This helped me so much, Thank you.
can you help me answer these?
At the beginning of the year, a wildlife area that is 1,000,000 ha in size has a population of 90
Brown bears with a per capita growth rate of 0.02. It's estimated that brown bears need a territory
of about 10 km2
per individual (note: 1 km2
= 100 ha). Use this information to answer the
following questions.
a. What is the density of brown bears in this wildlife preserve currently?
b. What is the carrying capacity of the preserve?
c. What is the population growth rate for this year?
your vid tought me much better than my teacher. Thanks
me too
Gotta finish this before 11:59 on canvas
you make my shs STEM life bearable
i may find the last few helpful for algebra 2 thank you
This helped cuz Ian understand my teacher
That is extremely helpful! Thank you very much
Excellent video!! thanks so much! :) I just have one question, how do you enter the division for the last problem, log[5x10^6]/4log3 in a TI-84 Plus Calculator?...
for the third example with the house you can just make the exponent -13 for 13 years ago instead of 13 years from now and it still works
Thanks! With this method should I use the growth or decay equation?
for the problem where you are given the house value in 2015 and you are trying yo find the value in 2002, instead of doing all this work, you can just make the exponent -13, which is basically the number of years you have to go back
I am going to use this for my math work. Seems pretty helpful :)
u are a life saver
This is funny because im actually watching in 2020 but in a couple hours its gonna be 2021 so i found this video just before it was too late - Dec. 31, 2020
2021 gang
7:13
Look at the paper and Cry dug
thank you bro
You just saved my exam thank youuuuuu
I still can’t believe this vid was made almost 8 years ago meaning in 2016
Bro is actually saving me from failing online school which I genuinely hate ngl
THANK YOU SO MUCH ! math 120 is killing me 😓
If u haven’t plz make one on how to find the rate
Tomorrow is my final exams for the first semester! If I passed it, I’ll thank you so much!
Edit: Honestly, I didn’t understand this but with this vid, it seemed easy on ya boi.
did you pass?
Your accent makes math easier to learn HELP😭😭😭
TLDR
growth = FV
decay = PV
percentage = CAGR
in the first problem. why not using P(t)=Poe^kt?
Back in the 1960s, the group Spiral Staircase performed a song called "I Love You More Today than Yesterday", which includes the lyrics, "I love you more today than yesterday, but only half as much as tomorrow." Suppose the group first sang that song on (say) January 1, 1969. By how much would the singer's love have increased at the end of one year (January 1, 1970)?
Please write your answer as an exponential expression with a base of 2 (i.e. write it as "2"x")
if you know ans text me sir please
im confused at the last question, isnt it 5x10^8? to get 500 million? or am i doing something wrong. Hope you can reply
How about finding the number of years to get the value of number
it really helped me thanks a lot
I’m confused don’t you do the exponent first? Like before u multiply so wouldn’t you do the (1.08)^15 and then multiply that by 1000? Can someone explain
he did bro...he did
lol no hate but like u have to pay atttaioan
ik my english is shitty
This video is so helpful
why didnt you use y=ae^kt? for the first problem
Chansonida because he’s not gay
I know you asked this a long time ago but it might help someone else... Either method is valid but to use your suggested equation you must first calculate the value of k. The method used here is quicker.
Chansonida it wasn’t continuous growth
macka71 isn’t k just .08
For the bacteria problem that doubles every 20 minutes, how would the equation be written if t was in minutes and not hours?
Why is b (1+R)?
Do you have a video taking up questions like the last one you did?
Our teacher told us to use a(t)=a*e^rt
And your equation is y=a(b)^x
What's the difference?
I solved for the first problem using my teacher's method and got a completely different answer
thank you for this video, it rlly helped!
A very helpful channel it is! ❤
Please what the maening of (d)is it elur fixed ?and how (d=1+r)
Please idont know this point
Fuck yeah. I’m here the day of my exam that due at 3 today trying to speed run this💅
Greetings from the year 2020
Thank you Khan academy !it was very helpful. Please upload more .
can you re teach the bacteria one, what do you mean by you can use minutes? Also what if the minutes is more than 60 mins how can you convert it to Hours then?
Let’s say your equation is y = 25(.85)^t
The question I need help with is “How much medicine is leaving the body each hour?” Would the answer be 15% or 85%? Because you get the .85 in the equation you’d have to do 1-0.15. I’m confused??
Your rate is equal to 0.15, as 1-r is equal to 0.85
Thank you.
Which value represents the initial amount or (A)?
original value in the equation
2:57 am now and preparing for the test at 12:30 today
hey, why not write the equation with (1+) when its the bacteria part where it starts to increase throughout the time
Thank you very much
What is the difference tho?