SKIP # 14 SHOW ALL WORK PLEASE AND I WILL GIVE AND 80 points for it

On a piece of paper graph f(x)=5•(0.4)^x

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?

In which form is the following function written? y = - 2(x – 3)(x + 5)