1. Write the successor &predecessor of each of the following:
a) -- 145
b) -- 200
c)| 45 - 26
d)| -- 4691
2. Find the sum:
a) --225 & -- 205
b) - 300, 300, 367 & --545
c) 637, -450 & --990
please give answer step by step explanation in notebook please ​