About 20% of the time you sleep is spent in rapid eye movement (rem) sleep, which is associated with dreaming. if an adult sleeps 7 to 8 hours, which inequality shows how much time, in hours, is spent in rem sleep?
1.4 < h < 1.6
35 < h < 40
0.35 < h < 0.4
14

The rows and columns of lattice points in a three-by-three square array are evenly spaced one unit apart. how many distinct triangles with at least one side of length 2 units can be drawn using three lattice points for the vertices?

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?

Which of the following can be used to explain a statement in a geometric proof?