Answer:
x = -2.9
y = 2.6
x+y = -2.9+2.6
= -0.3
1. 100 000, 89 000, 67 000, 55 000
2. 45 678, 34 567, 23 456, 12 345
3. 98 765, 87 654, 76 543, 65 432-
342
Step-by-step explanation: