How do you do pythagorean theorem ? , i don't understand whether or not to add or subtract before finding the square root .

Solutions for 2x+7 less than or equal to 3x-5

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?

Ineed to know the answer to this algebra question.