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**1. Homework Statement**

The velocity v of the flow of blood at a distance r from the central axis of an artery of radius R is v=k(R^2-r^2) where K is the constant of proportionality. Find the average rate of flow of blood along a radius of the artery. (use 0 and R as the limits of integration)

**2. Homework Equations**

Average value formula in a closed interval using intergration

**3. The Attempt at a Solution**

I'm having difficulty finding what variable to integrate.

I'm using the math to find the average value, I integrate the equation in terms of r with the upper limit R and a lower limit of 0. My answer does come out as a single number containing variables 2R^2k/3. I don't know if this is the right way of doing the problem.

Thanks for your help!

AJ