Oddbean new post about | logout
 LongFast is the default channel so you have more chances to get contact with people on that channel. 
 I think part of my problem is I'm using the web app so hopefully get some clarity when I get a proper phone device. 

Thanks for your help. 
 Try to use the web UI. Just you have to connect on a wifi and browser mestastastic.local 
  Let u(j) = 4*j + 20. Calculate u(-18).
Answer: -30