  Math Central - mathcentral.uregina.ca  Quandaries & Queries    Q & Q    Topic: exponential model   start over

3 items are filed under this topic.    Page1/1            The spread of a rumor 2012-04-09 From Roohi:The function f(t) = a/(1+3e^(-bt)) has also been used to model the spread of a rumor. Suppose that a= 70 and b=3 0.2. Compute f(2), the percentage of the population that has heard the rumor after 2 hours. Compute f'(2) and describe what it represents. Compute lim t approaches infinity and describe what it represents.Answered by Penny Nom.     Fitting the curve y=a*exp(b*x)+c 2009-08-12 From aika:Could one show me the complete algorithm and formula for finding the coefficients (a,b, and c) in exponential regression model y=a*exp(b*x)+cAnswered by Robert Dawson.     Conservation, consumption and population growth 2001-06-04 From Steve:I'm trying to quantify the relation between conservation/consumption and population growth. For instance let's consider California: The 2000 census states that California's population grew from 29,760* in 4-1990 to 33,871 in 4-2000. I want to find r or rate of growth per year. Based on the exponential growth formula for population growth: ... Answered by Penny Nom.      Page1/1    Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.    about math central :: site map :: links :: notre site français