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Oil consumption is increasing at a rate of 1.9% per year. What is its doubling time?
I'm not sure if this is linear increase or exponential.
if its linear
 one year ago
 one year ago
Oil consumption is increasing at a rate of 1.9% per year. What is its doubling time? I'm not sure if this is linear increase or exponential. if its linear
 one year ago
 one year ago

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perlBest ResponseYou've already chosen the best response.1
, no , this website says its exponential http://www.algebra.com/algebra/homework/logarithm/logarithm.faq.question.112025.html
 one year ago

perlBest ResponseYou've already chosen the best response.1
, if its linear then y = Ao ( 1 + .06*t ) if its exponential then y = Ao ( 1 + .06)^t
 one year ago

uzumakhiBest ResponseYou've already chosen the best response.1
i think its exponential 2 = 1 ( 1 + 0.06)^t now calculate t
 one year ago

radhBest ResponseYou've already chosen the best response.0
Oh, wait. That's right. I apologize. I graphed it wrong.
 one year ago

perlBest ResponseYou've already chosen the best response.1
how will i know if its exponential or not?
 one year ago

perlBest ResponseYou've already chosen the best response.1
here is another example http://www.physics.uoguelph.ca/tutorials/exp/intro.html
 one year ago

perlBest ResponseYou've already chosen the best response.1
why isnt the following example linear ? "For example, let's look at a population of wee beasties which increases by 10% per year. If there were 100 wee beasties now, there would be an increase of 10 wee beasties after a year. "
 one year ago

uzumakhiBest ResponseYou've already chosen the best response.1
see in question it increases 1.9% per year first year let consumption = x next year = 1.9*x/100 later year = 1.9(1.9*x/100)/100 if you plot its graph you get exponential curve try it
 one year ago

uzumakhiBest ResponseYou've already chosen the best response.1
in your second example population first year = 100 population second year = 110 population third year = 121 it also not linear
 one year ago

perlBest ResponseYou've already chosen the best response.1
you need a plus somewhere
 one year ago

perlBest ResponseYou've already chosen the best response.1
it should be next year consumption = last year consumption* ( 1 + 1.9/100)
 one year ago

perlBest ResponseYou've already chosen the best response.1
so we have x1 = x x2 = x1 (1.019) x3 = x2 (1.019) = [x1 (1.019) (1.019) ]
 one year ago

perlBest ResponseYou've already chosen the best response.1
better start with zero, x0 = x x1 = x0 (1.019) x2 = x1 (1.019) = [x0 (1.019) ] (1.019) = x0 (1.019) ^2
 one year ago

uzumakhiBest ResponseYou've already chosen the best response.1
calculate x1,x2 ,x3 and try to find x2  x1 = x3 x2 if its write then only its linear
 one year ago

perlBest ResponseYou've already chosen the best response.1
so did you agree with my math?
 one year ago

perlBest ResponseYou've already chosen the best response.1
right, clearly x2x1 != x3  x2
 one year ago

uzumakhiBest ResponseYou've already chosen the best response.1
yes i agree so what you think its linear or exponential
 one year ago

perlBest ResponseYou've already chosen the best response.1
i think its a little ambiguous however
 one year ago

perlBest ResponseYou've already chosen the best response.1
, you could also have y = x0 ( 1 + .019 * t ) , no ?
 one year ago

perlBest ResponseYou've already chosen the best response.1
ok how would you word it so that it is linear?
 one year ago

uzumakhiBest ResponseYou've already chosen the best response.1
let if increase every year is same then its linear for example if population of city inc by 20 people every year then we can say that its linear
 one year ago

perlBest ResponseYou've already chosen the best response.1
ok , so we wouldnt use percentage for a linear increase
 one year ago

perlBest ResponseYou've already chosen the best response.1
if there is a percentage growth , like population percentage growth , grows at a constant percentage, it is exponential growth
 one year ago

perlBest ResponseYou've already chosen the best response.1
ok now doubling time makes sense
 one year ago

perlBest ResponseYou've already chosen the best response.1
doubling time is the time it takes for the initial amount to grow 100% , leaving you with double
 one year ago

uzumakhiBest ResponseYou've already chosen the best response.1
yes did you get your answer?
 one year ago

perlBest ResponseYou've already chosen the best response.1
yes, the math i didnt have trouble with. just the understanding
 one year ago

perlBest ResponseYou've already chosen the best response.1
i have a much harder problem, differential equation
 one year ago

perlBest ResponseYou've already chosen the best response.1
its a logistic growth problem
 one year ago

uzumakhiBest ResponseYou've already chosen the best response.1
ok then now you can close the qustion after giving me medal...............lol
 one year ago

perlBest ResponseYou've already chosen the best response.1
you stuck it out , good work
 one year ago
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