What is the slope of a line that passes through (–12,15) and (0,4)?

Which of the following represents the factorization of the trinomial below? x^2+7x-30

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

I'm marking the brainliest and it's 15 points