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Ldaniel
Group Title
If f(x) ≤ g(x) on the interval [a, b], then the average value of f is less than or equal to the average value of g on the interval [a, b].
True
or
False
 one year ago
 one year ago
Ldaniel Group Title
If f(x) ≤ g(x) on the interval [a, b], then the average value of f is less than or equal to the average value of g on the interval [a, b]. True or False
 one year ago
 one year ago

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tkhunny Group TitleBest ResponseYou've already chosen the best response.0
Couple of ways to go about it, I suppose. Can you write an expression that represents the average value on the interval?
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.0
Area = Height * Width or, in this case Area = (Average Height) * Width Are you seeing how to do it?
 one year ago

Ldaniel Group TitleBest ResponseYou've already chosen the best response.0
so its true?
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.0
?? How did you get to that? We haven't done anything, yet. Generally, we call this guessing, but you may be going on evidence that you are not sharing. How do you find the area under a curve on a Cartesian Coordinate system?
 one year ago

Ldaniel Group TitleBest ResponseYou've already chosen the best response.0
we don't have real values so i just used a and b
 one year ago

Ldaniel Group TitleBest ResponseYou've already chosen the best response.0
Every continuous function has an antiderivative right?
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.0
Yes. I'm pretty excited to see where you are going with that. It's important to point out that we may not be able to write the antiderivative. We just need to know that it exists.
 one year ago

Ldaniel Group TitleBest ResponseYou've already chosen the best response.0
yes to what?
 one year ago

Ldaniel Group TitleBest ResponseYou've already chosen the best response.0
If F(x) is an antiderivative of f(x) and G(x) = F(x) + 2, then G(x) is an antiderivative of f(x) right? or am i wrong?
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.0
So close. G and F are not necessarily related. Let's back up just a hair. We can calcualte the average value of f(x) on the interval [a,b] using the integral and that rectangle formula. Average Value of f(x) on [a,b] = \(\dfrac{\int\limits_a^b f(x)\;dx}{ba}\). Do you see how htat works?
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.0
And, as you very correctly pointed out, \(\int\limits_a^b f(x)\;dx = F(b)  F(b)\), where \(F(x)\) is an antiderivative of \(f(x)\). Still making sense?
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.0
If f(x) ≤ g(x) on the interval [a, b], then the average value of f is less than or equal to the average value of g on the interval [a, b]. Well, then, all we know is \(f(x) \le g(x)\) and we are trying to prove that \[\dfrac{F(b)  F(a)}{ba} \le \dfrac{G(b)  G(a)}{b  a}\]. Can we do it?
 one year ago
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