The graph shows how the length of time a stroller is rented at an amusement park is related to the rental cost. What is the rate of change shown in the graph? A.) $2/hour
B.) $4/hour
C.) 2 hours/dollar
D.) 4 hours/dollar

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?