Help me please.

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?

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.

Find the slope of the line that passes through the points (-2, 4) and (-5, -6). -2/7 10/3 -2/3