Friends You Can Count On

You have agreed to help an Ecaflip win a kinda stupid bet (aren't all bets stupid?). Get your thinking cap on and prepare for a little bit of maths. Don't forget to consult your notes as soon as they're complete. Matt Hematik's help will prove particularly useful, especially if you don't know how to add 2 and 2 together... If your answers really don't seem to add up, go and double check with Bo Pye that the bet's still on!

1. [-44, 44]
2. [-44, 44]
3. [-51, 40]
4. [-52, 37]
7. [-53, 40]