Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
UPGRADE TO PRO
APPS
TOUR
R = p-(p-r)/(K+1)^((0.02*K)/(p+.1)) where p=.68,r=.23,K=26
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random