Which expression would be easier to simplify if you used the associative property to change the grouping? A. {(-1/3) + (-2/3)] + (-4/5)
B. (160 + 40) + 27
C. 0.85 + [0.15 + (-1/3)]
D. 1 + [3/4 + (-1/4)]

The number of possible solutions of a polynomial can be found by looking

Describe what moves you could use to create the transformation of the original image shown at right

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?