An electrical circuit switches instantaneously from a 8 volt battery to a 22 volt battery 8 seconds after being turned on. Sketch on a sheet of paper a graph the battery voltage against time. Then fill in the formulas below for the function represented by your graph.

For ,
For , .

At what point or points is your function discontinuous?

(Give your answer as a comma-separated list, or enter the word none if there are no discontinuities.)