L=2.43*W^.3326
You don't say what L and W stand for. I assume L stands for the "windspan", whatever that is, and W for the weight. So you say it "ways" (or weighs?) 10 lbs. So, I would simply plug 10 into the formula in place of the W. That gives me L=2.43(10)^.3326. Mathematically, that looks like \(\displaystyle L=2.43(10)^{.3326}\). I don't know whether you are to use logs or not. So, I will just use a graphing calculator. To get 10^.3326, key in 10, then the "^" key then .3326 and press Enter getting 2.150799862. That is then multiplied by 2.43 for your final answer.
If you have a scientific calculator key in 10 then look for the \(\displaystyle x^y\) key, press that then the .3326 getting a partial answer that must be multiplied by 2.43.
A real problem here is we don't know what the units are. You must use the same units that the formula stipulates. In other words if the formula is built on the assumption that the weight is in pounds and the wingspan is in feet then those must be the units used. If the formula is for kilograms and meters, you won't get the correct answer if you feed in pounds.
