Algebra - Is it possible to solve it in terms of r?

[Femme_physics]

I appear to be getting two sides with the same unknown. Does it mean I'm screwed and can't solve it in terms of "r"?

http://img716.imageshack.us/img716/4409/image2011121500032.jpg (http://imageshack.us/photo/my-images/716/image2011121500032.jpg/)

[BruceW]

perhaps too much help there... I was thinking of writing a hint like 'what can you do to both sides to get r on only one side of the equation'

[Doc Al]

perhaps too much help there... I was thinking of writing a hint like 'what can you do to both sides to get r on only one side of the equation'
Oops... you're probably right, Bruce.

[Femme_physics]

I can still see the original message in my email you know? :wink:

Thanks, at any rate. I seemed to have forgotten basic algebra!

[Doc Al]

I can still see the original message in my email you know? :wink:

Yeah, I know. :tongue:

[mtayab1994]

Is that a Pi or an r?

[Mark44]

Both \pi and r are in the equation.

[Mark44]

You ended up with 100\pir4 = 4000\cdot103r.

Move everything over to one side, and take the largest common factor out of both terms. The equation should be pretty easy to solve from there.

[HallsofIvy]

Is it really "1000\cdot10^3". That seems a very strange thing to write. It is, of course, the same as 10^6= 1000000.