Signals and Systems - Power and Energy level signals calculation

[Ribice]

Homework Statement

http://i.imgur.com/j8JdV.png

Homework Equations

http://i.imgur.com/Wobmo.png

The Attempt at a Solution

I wasn't really sure where to start with. Can energy level be calculated at any of these, since the signal stretches to infinity?

I'm very thankful for any hint or solution.

 

[rude man]

Well, what does ∫f²(t)dt with lower limit = -∞ and upper limit = +∞ look like?

As for average power, easiest is to just integrate f² over 1 period and divide by the period.