How can you get 2 to the power of -3 from the fraction 1/8?

From indices, 8 = 2³.

hence, 1/8 = 1/2³

when u bring the power up to the numerator, the power becomes negative. hence your answer

2^-3

Yourself by using the internet

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .