11. a(t) = 50, U = 10, xo=20

12. a(t) = -20, Vo = -15, xg = 5

13. a(t)= 3, 5, xo=0

14. a(t) = 2t+1=-7, X0 = 4

15. a(t) = 4(1+3)², U = -1, Xo = 1

16. a(t)=

=-1₁ Xo = 1

17. a(t)=

√1+4

1

(t+1)³=0, x₁ = 0