Shelley drew squares A and B to show equivalent fractions. She said I separated square A into 2 equal parts and square B into 8 equal parts. Then I shaded 2 parts of A. I shaded 4 parts of B to show an equivalent fraction. Since B has more equal parts, I doubled the number of shaded parts. What did Shelley do right? What did she do wrong?

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