he quadratic regression graphed on the coordinate grid represents the height of a road surface x meters from the center of the road. A graph shows the horizontal axis numbered negative 7 to positive 7 and the vertical axis numbered negative 1.25 to positive 1.25. A line shows an upward then downward trend. What does the graph of the regression model show? The height of the surface decreases from the center out to the sides of the road. The height of the surface increases, then decreases, from the center out to the sides of the road. The height of the surface increases from the center out to the sides of the road. The height of the surface remains the same the entire distance across the road.

Statement reason 1. δabc is similar to δced. given 2. 3. definition of slope 4. slope of slope of definition of slope 5. slope of × slope of multiplying the slopes 6. slope of × slope of substitution property of equality 7. slope of × slope of simplifying the right side the table contains the proof of the relationship between the slopes of two perpendicular lines. what is the reason for statement 2? a. parallel line segments that meet a common perpendicular line are proportional in length. b. the lengths of vertical and horizontal sides in congruent triangles are in a common ratio. c. trigonometric identities determine the lengths of the legs in a right triangle. d. corresponding side lengths in similar triangles are proportional in length.