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Find position and velocity at t=0? [closed]

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Full question:

An object moves with constant acceleration. At t= 2.50 s, the position of the object is x=2.00 m and its velocity is v= 4.50 m/s. At t= 7.00 s, v= -12.0 m/s.
(a) the position and the velocity at t= 0;
(b) the average speed from 2.50s to 7.00 s, and
(c) the average velocity from 2.50s to 7.00 s.

I tried using the kinematic equations of motion for constant acceleration but my answers make no sense.

closed with the note: No effort.
asked Feb 5 in Physics Problems by Phycftp (110 points)
closed Feb 18 by sammy gerbil
What answers do you get? Why don't they make sense? Please show your calculation. Then we can see what you might be doing wrong.