Plz help me with these 3 question for math class

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?

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?