The perimeter of a rectangle is 56 cm. Two times the length of the rectangle is 4 less than 3 times the length. Write two equations and solve the system to find the length and width. Solve using substitution or elimination.

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