Prove that the diagonals of a rectangle bisect each other.
Plan: Since midpoints will be involved, use multiples of __ to name the coordinates for B, C, and D.

3

1

4

2

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