Find the open t-intervals on which the particle is moving to the right. (Enter your answer using interval notation.)?

x(t) = t3 − 12t2 + 21t − 5, 0 ≤ t ≤ 10

(c) Find the velocity of the particle when the acceleration is 0.

(b) Find the open t-intervals on which the particle is moving to the right. (Enter your answer using interval notation.)
Update: C) v(t) = 3(t − 1)(t − 5) , t=4 , v(t)=-9?
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