Mr. Brooks delivers 124 textbooks to 4 classrooms. If the ratio of books to classrooms is the same, how many textbooks does he deliver to 18 classrooms? 558
279
72
27

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