Which graph represents an even function?

Icould really use some with this question.

If chord ab is congruent to chord cd, then what must be true about ef and eg?

If you flip a coin 3 times, what is the probability of flipping heads 3 times? a. p(3 heads) = 3/8 b. p(3 heads) = 1/6 c. p(3 heads) = 1/8 d. p(3 heads) = 1/2