Combine like terms of (x + y)^2 + (ax + b)?

Aportion of a line bounded by two points is defined as

Nine more than four times a number is the same as one less than twice the number. find the number?

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?