The last one since it contains only fractions

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:BrainliestBunch
Step-by-step explanation:
(x²-1)(x+1)≥0
As it has two multiples,
Therefore,
Either,
x²-1≥0
x²≥0+1
x²≥1
x≤√1
x≤1
Or,
x+1≥0
x≥-1
3 is 93 and 4 is -18 i hope this helped