Posted by Angel on Thursday, September 22, 2011 at 9:18am.
The number of people who donated to a certain organization between 1975 and 1992 can be modeled by the equation
D(t)=10.61t^(3)+208.808t^(2)168.202t+9775.234 donors, where t is the number of years after 1975. Find the inflection point(s) from t=0 through t=17 , if any exist.
a. There are no inflection points from t=0 through t=17 .
b. There is one inflection point at t=6.56.
c. There are inflection points at t=0 and t=17.
d. There is one inflection point at t=0.15.
e. There are inflection points at t=0, t=0.15,and t=17.
I thought it was B.

Calculus  Bosnian, Thursday, September 22, 2011 at 9:50am
An inflection point is a point on a curve at which the second derivative changes sign. You must find point where second derivative = 0
Go on:
wolframalpha dot com
When page be open in rectangle type:
second derivative of 10.61t^(3)+208.808t^(2)168.202t+9775.234
and click option =
When you see result click option:
Show steps
Then in rectangle type:
solve 417.61663.66t=0
Inflection point is:
t=6.5601

Calculus  Angel, Thursday, September 22, 2011 at 9:58am
Thanks, i thought it was B. your awesome.
Answer This Question
Related Questions
 PreCalculus  The median salary for male workers for the years 19752006 can be...
 Intermediate Algebra  a male born in 1975 does not want his future wife to ...
 pre calc  The following polynomial approximates the rabbit population in a ...
 Intermediate algebra  The number of trout in America, since 1970, is given by ...
 polynominals  The number of trout in America, since 1970, is given by the ...
 math  The number of cases for a disease has reduced by half every 10 years: ...
 algebra 2  Solve the problem. The growth in the population of a certain rodent ...
 math  I have a few question so I will number them off. Please answer them for ...
 stats help  find the number of road fatalies attributed to impaired drivivng ...
 stats help  find the number of road fatalies attributed to impaired drivivng in...
More Related Questions