You can put this solution on YOUR website! go to http://www.scribblar.com/mg9yqg9 for my email address, send me an email and I will answer this.
basically, you don't use logarithms...if that is what you are trying to do. You can get rid of the negative exponent by moving it to the bottom and making it positive (hopefully this jogs your memory on that).
So basically, you get
Then multiply both sides by and divide both sides by .035 and you get
cube both sides to find d
send the answer to my email address listed on scribblar and I will verify the answer.
ps There are other ways/techniques of solving this as well.