13. [-/1 Points] DETAILS Consider a particle moving along the x-axis where x(t) is the position of the particle x (t) = +3 - 6+2 + 9t - 7, Ost= 10 (a) Find the velocity and acceleration of the particle. x'(t ) = x " (t ) = (b) Find the open t-intervals on which the particle is moving to the right. (Enter you (c) Find the velocity of the particle when the acceleration is 0. Need Help? Read It Master It