(a) (sin A + sin B) (sin A-sin B)

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

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?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.