Here's the segment one student created on Screen 1. Use whatever tools you want to find the exact length.
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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?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

State one method by which you can recognize a perfect square trinomial.