How can you decide which operation to use to solve a two step equation

5(-9w) put expression in distributive property

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

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