I’m unsure as to what the answer to this question is

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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?

Graph y = -|x| + 2. click on the graph until the correct one appears.