1. Which of the following reasons is valid for proving a quadrilateral is a trapezoid? (1) Diagonals bisect angles
(2) All sides are congruent
(3) All sides are parallel
(4) One pair of opposite sides are parallel and one is not

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth