An object is launched from a platform. Its height (in meters), x seconds after the launch, is
modeled by:
h(x) = -5x2 + 20x + 60
How many seconds after launch will the object land
on the ground?
seconds

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