A student draws two parabolas on graph paper. Both parabolas cross the x -axis at negative 4 comma 0 and 6 comma 0 The y -intercept of the first parabola is 0 comma negative 12 The y -intercept of the second parabola is 0 comma negative 24 What is the positive difference between the values of A for the two functions that describe the parabolas? Write your answer as a decimal rounded to the nearest tenth.