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im very confused

Screen Shot 2019-09-23 at 12.52.26 PM.png

A particle moves according to a law of motion s = f(t) = 1 - 1212 + 361 + 4, 1 2 0, where f is measured in seconds and $ in meters.
(a) Find the acceleration at time f.
(b) When is the particle speeding up?
(c) When is the particle slowing down?
(a) a(1) =
(b)
<1 <
and t >
(C) 0 51 <
and
<1 <

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