Ah, but I'm still not exactly sure how you got that. How do the words match up to make the formula?

is k proportional to S?

Here's another question that I'm having trouble with...

Write a formula representing the following function. The number of animal species, *N*, of a certain body length, *L*, is inversely proportional to the square of *L*. Use *k* as the proportionality constant.

I said N(L) = k*-L^2... But this is wrong. I'm not exactly sure what everything in the question means.

Edit: Nevermind, I got it right. N(L) = k/L^2