Verified Answer :

The sequence in question 3 goes 260, 180, 100, 20, -60 and -140.
The answer would be -60 and -140.

  1. 500-80=420-80=340-80=260-80=180-80=100-80=20-80=-60-80=-140
    so the answers are -60 and -140

    4. so from left to right it is 4,-2, 2, then 0 etc. 4+-2 equals 2 then -2+2 equals 0 

    I hope this helps!