Which numbers are rational numbers 2, -4.0, 8.1, 3/4, 0, -8

All of them except,for 8.1

The best and most correct answer among the choices provided by your question is the first choice or letter A which is "45<s<65."

Let x = speed (in mph) 

45 <= x <= 65 for a car 
45 <= x <= 55 for a tractor 

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