Please help! Jacob sells lemonade at a park. His cost to sell the lemonade is a one-time fee for the table, plus a fixed cost to make each cup of lemonade. The line shows the total cost, y, for x cups of lemonade. y =__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?