Rewrite with only sin x and cos x. sin 3x - cos x
a. 2 sin x - sin^3x - cos x
b. 2 sin x cos^2x + sin x - 2 sin^3x - cos x
c. 2 sin^3x cos^4x + 1
d. 3 sin x cos x - sin^3x - cos x

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