plz help and thank you so much

Given s(-21 +6: where sit) is in feet and t is in seconds, find each of the following. a vo b) alt) c) The velocity and acceleration when 1 = 2 sec bj a(1) = c) When ( = 2 sec, the velocity is (Simplify your answer.) When t= 2 sec, the acceleration is (Simplify your answer.)