You know what... fuck all that shit you guys have been saying.
1. A tank wouldn't even be phases by a t-rex stepping on it, biting it, scratching it, or even trying to flip it over.
2. The tank wouldn't even have to shoot it... it would only have to run over the dinos foot and he'd fall over.
Anyway you look at it...
Tank - 1
Trex - 0