Write an expression in simplest form. the sum of the cost of d dinner and a $12 tip divided equally between 3 people

Plz me plz i need and plz delte this after answer

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?

Fast! find the length of cu. the triangles are similar. show your work.