HELPPP !! first box options are:
AB = DE,
CA=FD
angle B is congruent to angle E
angle A is congruent to angle D

second box options are: AB=DE
angle B is congruent to angle E
CA=FD,
angle A is congruent to angle D

third box options are :
angle A is congruent to D
AB=DE
AB=DF

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.

17 or maybe it’s about 2

Line ab is y = -7/5x + 56/5i don't understand  where point d comes into this.