confused :(

J

justjenn

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Feb 9, 2006
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The concentration of a certain drug in the bloodstream t minutes after swallowing a pill containing the drug can be approximated using the equation
nfjyx5.jpg
where C(t) is the concentration in arbitrary units and t is in minutes. Find the rate of change of concentration with respect to time at t = 5 minutes.

I am getting -3/1024 but I dont know if I am right. I am kind of confused....... :(
 
It's difficult to know where you are confused if you don't show how you got to where you are. What did you do?
 
tutorgirl said:
I got -1/32 units
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We don't really have the idea here, do we?

This is a calculus problem asking for the "rate of change". I think someone is going to have to calculate a derivative and evaluate it at t = 5 min. We can post bad answers all day, but until someone shows a process we won't get very far.
 
thanks tutorgirl for "trying" to help me but I dont think you are correct. I kinda guessed on my first answer. I posted on here because I dont know what to do or where to start, cant really go to much into that now can I?
 
I don't get it, justjenn. Posting bad answers does not constitute helping, unless it motivates you to find the correct answer yourself.

Have you met the "First Derivative"? You cannot solve this problem, usung calculus, without it. This is mathematics. "kinda guess"ing normally is quite insufficient.

You have a function, C(t). What is its first derivative, C'(t)?? It is a test. You are supposed to know how to do that.

Note: That is an hilarious formula for blood concentration. It's even funnier without Domain restrictions. What's C(-1/4)?? The concentration is greater than zero 15 seconds before taking the pill??? That can't be right. C(0) = 1/8. Wow!! The concentration goes up before the pill even gets to the stomach. Anyway, I digress...Where's that first derivative?
 
justjenn said:
I am getting -3/1024
Click to expand...
How?

Please reply showing all of your work and reasoning.

Thank you.

Eliz.
 
You MUST be able to get the First Derivative. Show how you plan to do that.
 
justjenn said:
anyone...willing to work with me?
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Are you willing to work with us? If so, kindly please reply showing your steps.

Thank you.

Eliz.
 
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