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[30=63(.5)^(t/10)+19,t]
Solve[30=63(.5)^(t/10)+19,t]
Natural Language
Math Input
Extended Keyboard