Desi is making cookies for her homeroom class. The recipe makes one dozen cookies and calls for 12 cup of chocolate chips. Since there are 30 students in her homeroom class she has decided to triple the batch. How many cups of chocolate chips does she need?

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?