a researcher compared the heights and shoe sizes for 50 men, selected at random. the equation shown describes a line of best for the data, where x is the shoe size and y is the height in inches . y=1.6x+48

Issof claims that the scale factor is 1/2. which statement about his claim is correct

How do you use the elimination method for this question? explain, because i really want to understand!

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?