1. there are ti emulators (firebird, ti48 are the open ones, there's also AlmosTI)
   Firebird is for Ti-Nspire, while ti48 is for older devices (it supports A LOT of types of calculators).

2. there are a lot of great app options, i kinda love HiPER (it kinda sucks at graphs, but it does literally everything you would ever want from a calculator)

Firebird emulator:

They're disgusting creatures, but are so lovely. My grandma got me ducks (without asking for permission) after my show chicken died and I became obsessed because the lil babies imprinted on me immediately. I'm the person people go to if they have duck questions. Raising and caring for the birds is my passion.

I've spent so much time and energy and money on them. I have a duck that got crippled when she was a baby due to a vitamin deficiency. I spent weeks giving her supplements and doing physical therapy on her to try to get her legs working enough for her to not need put down. She's doing great now. She walks on her knees, but gets around so well despite everything and is thriving. I named her Legs.

I have another duck, Sonic, that I was worried about needing to put down. I had an aggressive male crush the little dude in a fight. Sonic's air sac was ruptured and he had dislocated ligaments and a cut on his back. He also got strings caught around his legs that got embedded in his legs that I didn't notice right away. I performed minor surgery to get the strings out and he spent a week in the duck hospital (a crate in my bathroom) getting supplements and antibiotics and herbs that help with inflammation. I put down the aggressive male during that week because he was a danger to the whole flock. Sonic got better and is running around hella fast like nothing happened.

I could go on and on about my birds and their lives and all that, but I'd end up writing a novel lol.