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.
solve for x: 28=60*(1/2)^(x/30)+20
solve for x: 28=60*(1/2)^(x/30)+20
Natural Language
Math Input
Extended Keyboard
