Students in MATH 1110 will typically be going on to MATH 1180 (for eventual calculus) or MATH 2000 (brief calculus). The TI-83 (not Plus), TI-86, TI-92 and the TI-92 Plus are no longer manufactured.
The watches' calculator function can add, subtract, multiply, and divide up to eight digits. As for watch functions, you get dual time, an alarm, stopwatch functionality, ...