A particle moves along the x-axis so that its velocity at time 0 < t < 18 is given by v(t), whose graph is shown in the figure below. The inflection points of the graph are marked with green circles. Find all intervals of time when the particle is moving to the left

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!