What is the sum of the solutions of the 2 equations below? -14x = 280
9 + 5y = 69

A. -20
B. 12
C. -12
D. -8
E. 8

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Graph the system of equations. {6x−4y=−244x−8y=−32 use the line tool to graph the lines.

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