I am stuck on the steps of getting the answer?!

3.68(1-4n)=-47.84

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

Triangle knm is what is true about the sides of knm