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need help with this two question! A particle moving on the x-axis has position x(t) = 21 3 +3t -36t+ 20 a. Find the velocity

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need help with this two question!

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A particle moving on the x-axis has position x(t) = 21 3 +3t -36t+ 20 a. Find the velocity of the particle at time t. b. Find the acceleration at time t. C. When does the particle stop and change direction? A pebble is dropped into a calm pond, causing ripples in the form of concentric circles. The radius r of the outer ripple is increasing at a constant rate of 1 foot per second. When the radius is 6 feet, at what rate is the total area A of the disturbed water changing

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