given a=[-1 -2 3 4 8 -6 0 1 5] and b= [-5 -1. 6 4 1 2 0 -4 2] what is x if b-x=a? A.[4 -1 -3 0 7 -8 0 4 3],b. [-4 1 3 0 -7 8 0 -4 -3] c. [-6 -3 9 8 9 -4 0 -2 7], d. [6 3 -9 -8 -9 4 0 2 -7]

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?