Simplify 3x − 2y + 6 − 6x + 5y − 8.

a) −2xy

b) −2x2 y2

c) −3x − 7y − 2

d) −3x + 3y − 2

e) −3x2 − 7y2 − 2

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?