Answers:

1. 40 metres saved

2. 21 and 34; The Fibonacci Sequence
   

3.  3/28

   Explanation: Probability of first slice being pepperoni: ⅜.  Probability of the second slice being pepperoni: 2/7 (since one pepperoni is gone and only 7 total slices remain).  Calculation: ⅜ x 2/7 = 3/28
   

4. -115 metres