Answer:
1.f 2.a 3.j 4.e
Step-by-step explanation:
you add and subtract the needed like terms
for example you can add 3x with 4x but not with 4x² because it's a different degree
The larger number is 10 - x.
2(10 - x) - (-20)
20 - 2x + 20
40 - 2x



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